diff --git a/include/phxpaxos/node.h b/include/phxpaxos/node.h
index fa7026ddf..14aae0d2f 100644
--- a/include/phxpaxos/node.h
+++ b/include/phxpaxos/node.h
@@ -33,7 +33,7 @@ namespace phxpaxos
 
 class NetWork;
 
-//All the funciton in class Node is thread safe!
+//All the function in class Node is thread safe!
 
 class Node
 {
@@ -42,7 +42,7 @@ class Node
     virtual ~Node() { }
 
     //If you want to end paxos, just delete poNode.
-    //But if you use your own network, poNode can be deleted after your own network stop recieving messages. 
+    //But if you use your own network, poNode can be deleted after your own network stop receiving messages.
     static int RunNode(const Options & oOptions, Node *& poNode);
 
     //Base function.
@@ -142,18 +142,18 @@ class Node
     //Qos
 
     //If many threads propose same group, that some threads will be on waiting status.
-    //Set max hold threads, and we will reject some propose request to avoid to many threads be holded.
+    //Set max hold threads, and we will reject some propose request to avoid to many threads be held.
     //Reject propose request will get retcode(PaxosTryCommitRet_TooManyThreadWaiting_Reject), check on def.h.
     virtual void SetMaxHoldThreads(const int iGroupIdx, const int iMaxHoldThreads) = 0;
 
-    //To avoid threads be holded too long time, we use this threshold to reject some propose to control thread's wait time.
+    //To avoid threads be held too long time, we use this threshold to reject some propose to control thread's wait time.
     virtual void SetProposeWaitTimeThresholdMS(const int iGroupIdx, const int iWaitTimeThresholdMS) = 0;
 
     //write disk
     virtual void SetLogSync(const int iGroupIdx, const bool bLogSync) = 0;
 
     //Not suggest to use this function
-    //pair: value,smid.
+    //pair: value, smid.
     //Because of BatchPropose, a InstanceID maybe include multi-value.
     virtual int GetInstanceValue(const int iGroupIdx, const uint64_t llInstanceID, 
             std::vector<std::pair<std::string, int> > & vecValues) = 0;
diff --git a/include/phxpaxos/sm.h b/include/phxpaxos/sm.h
index 601c96c66..1a28da2b7 100644
--- a/include/phxpaxos/sm.h
+++ b/include/phxpaxos/sm.h
@@ -94,7 +94,7 @@ class StateMachine
     //Checkpoint file was on dir(sCheckpointTmpFileDirPath).
     //vecFileList is all the file in dir(sCheckpointTmpFileDirPath).
     //vecFileList filepath is absolute path.
-    //After called this fuction, paxoslib will kill the processor. 
+    //After called this function, paxoslib will kill the processor.
     //State machine need to understand this when restart.
     virtual int LoadCheckpointState(const int iGroupIdx, const std::string & sCheckpointTmpFileDirPath,
             const std::vector<std::string> & vecFileList, const uint64_t llCheckpointInstanceID);
diff --git a/include/phxpaxos/storage.h b/include/phxpaxos/storage.h
index 5f0bf58d0..299a6ac2b 100644
--- a/include/phxpaxos/storage.h
+++ b/include/phxpaxos/storage.h
@@ -29,7 +29,7 @@ namespace phxpaxos
 {
 
 //Paxoslib need to storage many datas, if you want to storage datas yourself,
-//you must implememt all function in class LogStorage, and make sure that observe the writeoptions.
+//you must implement all function in class LogStorage, and make sure that observe the writeoptions.
 
 class WriteOptions
 {
diff --git a/sample/phxecho/echo_sm.cpp b/sample/phxecho/echo_sm.cpp
index 51c6eb497..c6c5b2494 100644
--- a/sample/phxecho/echo_sm.cpp
+++ b/sample/phxecho/echo_sm.cpp
@@ -36,7 +36,7 @@ bool PhxEchoSM :: Execute(const int iGroupIdx, const uint64_t llInstanceID,
     printf("[SM Execute] ok, smid %d instanceid %lu value %s\n", 
             SMID(), llInstanceID, sPaxosValue.c_str());
 
-    //only commiter node have SMCtx.
+    //only committer node have SMCtx.
     if (poSMCtx != nullptr && poSMCtx->m_pCtx != nullptr)
     {
         PhxEchoSMCtx * poPhxEchoSMCtx = (PhxEchoSMCtx *)poSMCtx->m_pCtx;
diff --git a/sample/phxkv/kv_paxos.cpp b/sample/phxkv/kv_paxos.cpp
index c37e44d5e..184f8ec55 100644
--- a/sample/phxkv/kv_paxos.cpp
+++ b/sample/phxkv/kv_paxos.cpp
@@ -81,7 +81,7 @@ int PhxKV :: RunPaxos()
     oOptions.vecNodeInfoList = m_vecNodeList;
 
     //because all group share state machine(kv), so every group have same state machine.
-    //just for split key to different paxos group, to upgrate performance.
+    //just for split key to different paxos group, to upgrade performance.
     for (int iGroupIdx = 0; iGroupIdx < m_iGroupCount; iGroupIdx++)
     {
         GroupSMInfo oSMInfo;
diff --git a/src/algorithm/acceptor.cpp b/src/algorithm/acceptor.cpp
index 707493401..2269a1e0b 100644
--- a/src/algorithm/acceptor.cpp
+++ b/src/algorithm/acceptor.cpp
@@ -123,7 +123,7 @@ int AcceptorState :: Persist(const uint64_t llInstanceID, const uint32_t iLastCh
     }
     
     PLGImp("GroupIdx %d InstanceID %lu PromiseID %lu PromiseNodeID %lu "
-            "AccectpedID %lu AcceptedNodeID %lu ValueLen %zu Checksum %u", 
+            "AcceptedID %lu AcceptedNodeID %lu ValueLen %zu Checksum %u",
             m_poConfig->GetMyGroupIdx(), llInstanceID, m_oPromiseBallot.m_llProposalID, 
             m_oPromiseBallot.m_llNodeID, m_oAcceptedBallot.m_llProposalID, 
             m_oAcceptedBallot.m_llNodeID, m_sAcceptedValue.size(), m_iChecksum);
@@ -162,7 +162,7 @@ int AcceptorState :: Load(uint64_t & llInstanceID)
     m_iChecksum = oState.checksum();
     
     PLGImp("GroupIdx %d InstanceID %lu PromiseID %lu PromiseNodeID %lu"
-           " AccectpedID %lu AcceptedNodeID %lu ValueLen %zu Checksum %u", 
+           " AcceptedID %lu AcceptedNodeID %lu ValueLen %zu Checksum %u",
             m_poConfig->GetMyGroupIdx(), llInstanceID, m_oPromiseBallot.m_llProposalID, 
             m_oPromiseBallot.m_llNodeID, m_oAcceptedBallot.m_llProposalID, 
             m_oAcceptedBallot.m_llNodeID, m_sAcceptedValue.size(), m_iChecksum);
diff --git a/src/algorithm/instance.h b/src/algorithm/instance.h
index be7c858ed..09c3ed7d1 100644
--- a/src/algorithm/instance.h
+++ b/src/algorithm/instance.h
@@ -77,7 +77,7 @@ class Instance
     void OnNewValueCommitTimeout();
 
 public:
-    //this funciton only enqueue, do nothing.
+    //this function only enqueue, do nothing.
     int OnReceiveMessage(const char * pcMessage, const int iMessageLen);
 
 public:
diff --git a/src/algorithm/ioloop.cpp b/src/algorithm/ioloop.cpp
index 29a9d23d9..d61a95ff4 100644
--- a/src/algorithm/ioloop.cpp
+++ b/src/algorithm/ioloop.cpp
@@ -205,7 +205,7 @@ void IOLoop :: OneLoop(const int iTimeoutMs)
     DealWithRetry();
 
     //must put on here
-    //because addtimer on this funciton
+    //because addtimer on this function
     m_poInstance->CheckNewValue();
 }
 
@@ -240,7 +240,7 @@ void IOLoop :: DealwithTimeoutOne(const uint32_t iTimerID, const int iType)
     auto it = m_mapTimerIDExist.find(iTimerID);
     if (it == end(m_mapTimerIDExist))
     {
-        //PLGErr("Timeout aready remove!, timerid %u iType %d", iTimerID, iType);
+        //PLGErr("Timeout already removed!, timerid %u iType %d", iTimerID, iType);
         return;
     }
 
diff --git a/src/algorithm/learner.cpp b/src/algorithm/learner.cpp
index f037bfc4a..21f0e5f18 100644
--- a/src/algorithm/learner.cpp
+++ b/src/algorithm/learner.cpp
@@ -358,7 +358,7 @@ void Learner :: OnSendNowInstanceID(const PaxosMsg & oPaxosMsg)
     int ret = m_poConfig->GetSystemVSM()->UpdateByCheckpoint(oPaxosMsg.systemvariables(), bSystemVariablesChange);
     if (ret == 0 && bSystemVariablesChange)
     {
-        PLGHead("SystemVariables changed!, all thing need to reflesh, so skip this msg");
+        PLGHead("SystemVariables changed!, all thing need to refresh, so skip this msg");
         return;
     }
 
diff --git a/src/logstorage/log_store.cpp b/src/logstorage/log_store.cpp
index 77725e9ea..3f9cb44e6 100644
--- a/src/logstorage/log_store.cpp
+++ b/src/logstorage/log_store.cpp
@@ -286,7 +286,7 @@ int LogStore :: GetFileFD(const int iNeedWriteSize, int & iFd, int & iFileID, in
 {
     if (m_iFd == -1)
     {
-        PLG1Err("File aready broken, fileid %d", m_iFileID);
+        PLG1Err("File already broken, fileid %d", m_iFileID);
         return -1;
     }
 
@@ -317,7 +317,7 @@ int LogStore :: GetFileFD(const int iNeedWriteSize, int & iFd, int & iFileID, in
         {
             assert(iOffset != -1);
 
-            m_oFileLogger.Log("new file but file aready exist, now fileid %d exist filesize %d", 
+            m_oFileLogger.Log("new file but file already exist, now fileid %d exist filesize %d",
                     m_iFileID, iOffset);
 
             PLG1Err("IncreaseFileID success, but file exist, data wrong, file size %d", iOffset);
@@ -430,7 +430,7 @@ int LogStore :: Read(const std::string & sFileID, uint64_t & llInstanceID, std::
     if (iReadLen != (ssize_t)sizeof(int))
     {
         close(iFd);
-        PLG1Err("readlen %zd not qual to %zu", iReadLen, sizeof(int));
+        PLG1Err("readlen %zd not equal to %zu", iReadLen, sizeof(int));
         return -1;
     }
     
@@ -441,7 +441,7 @@ int LogStore :: Read(const std::string & sFileID, uint64_t & llInstanceID, std::
     if (iReadLen != iLen)
     {
         close(iFd);
-        PLG1Err("readlen %zd not qual to %zu", iReadLen, iLen);
+        PLG1Err("readlen %zd not equal to %zu", iReadLen, iLen);
         return -1;
     }
 
@@ -474,7 +474,7 @@ int LogStore :: Del(const std::string & sFileID, const uint64_t llInstanceID)
 
     if (iFileID > m_iFileID)
     {
-        PLG1Err("del fileid %d large than useing fileid %d", iFileID, m_iFileID);
+        PLG1Err("del fileid %d large than using fileid %d", iFileID, m_iFileID);
         return -2;
     }
 
@@ -650,7 +650,7 @@ int LogStore :: RebuildIndexForOneFile(const int iFileID, const int iOffset,
         if (iReadLen != (ssize_t)sizeof(int))
         {
             bNeedTruncate = true;
-            PLG1Err("readlen %zd not qual to %zu, need truncate", iReadLen, sizeof(int));
+            PLG1Err("readlen %zd not equal to %zu, need truncate", iReadLen, sizeof(int));
             break;
         }
 
@@ -674,7 +674,7 @@ int LogStore :: RebuildIndexForOneFile(const int iFileID, const int iOffset,
         if (iReadLen != iLen)
         {
             bNeedTruncate = true;
-            PLG1Err("readlen %zd not qual to %zu, need truncate", iReadLen, iLen);
+            PLG1Err("readlen %zd not equal to %zu, need truncate", iReadLen, iLen);
             break;
         }
 
diff --git a/src/master/master_mgr.cpp b/src/master/master_mgr.cpp
index d1d985dce..eb4bf1b54 100644
--- a/src/master/master_mgr.cpp
+++ b/src/master/master_mgr.cpp
@@ -129,7 +129,7 @@ void MasterMgr :: TryBeMaster(const int iLeaseTime)
 
     if (iMasterNodeID != nullnode && (iMasterNodeID != m_poPaxosNode->GetMyNodeID()))
     {
-        PLG1Imp("Ohter as master, can't try be master, masterid %lu myid %lu", 
+        PLG1Imp("Other as master, can't try be master, masterid %lu myid %lu",
                 iMasterNodeID, m_poPaxosNode->GetMyNodeID());
         return;
     }
diff --git a/src/master/master_sm.cpp b/src/master/master_sm.cpp
index 7e77f2064..fc6e3e56b 100644
--- a/src/master/master_sm.cpp
+++ b/src/master/master_sm.cpp
@@ -125,7 +125,7 @@ int MasterStateMachine :: LearnMaster(
 
     if (oMasterOper.version() != m_llMasterVersion)
     {
-        PLG1Debug("version conflit, op version %lu now master version %lu",
+        PLG1Debug("version conflict, op version %lu now master version %lu",
                 oMasterOper.version(), m_llMasterVersion);
         return 0;
     }
diff --git a/src/node/node.cpp b/src/node/node.cpp
index 039f11542..692f9636d 100644
--- a/src/node/node.cpp
+++ b/src/node/node.cpp
@@ -49,11 +49,11 @@ int Node :: RunNode(const Options & oOptions, Node *& poNode)
     }
 
     //step1 set node to network
-    //very important, let network on recieve callback can work.
+    //very important, let network on receive callback can work.
     poNetWork->m_poNode = poRealNode;
 
     //step2 run network.
-    //start recieve message from network, so all must init before this step.
+    //start receive message from network, so all must init before this step.
     //must be the last step.
     poNetWork->RunNetWork();