diff --git a/NEWS.md b/NEWS.md
index 85235333..b955de0e 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,7 @@
 Red Panda C++ Version 1.0.8
   - enhancement: auto complete '#undef'
   - enhancement: redesign components for compiler commandline arguments processing
+  - fix: selection calculation error when editing in column mode
 
 Red Panda C++ Version 1.0.7
   - change: use Shift+Enter to break line
diff --git a/RedPandaIDE/qsynedit/SynEdit.cpp b/RedPandaIDE/qsynedit/SynEdit.cpp
index 6aaad345..f408a50e 100644
--- a/RedPandaIDE/qsynedit/SynEdit.cpp
+++ b/RedPandaIDE/qsynedit/SynEdit.cpp
@@ -6625,12 +6625,18 @@ void SynEdit::setActiveSelectionMode(const SynSelectionMode &Value)
 
 BufferCoord SynEdit::blockEnd() const
 {
+    if (mActiveSelectionMode == SynSelectionMode::smColumn) {
+        return BufferCoord{
+            std::max(mBlockBegin.Char,mBlockEnd.Char),
+            std::max(mBlockBegin.Line,mBlockEnd.Line),
+        };
+    }
+
     if ((mBlockEnd.Line < mBlockBegin.Line)
       || ((mBlockEnd.Line == mBlockBegin.Line) && (mBlockEnd.Char < mBlockBegin.Char)))
         return mBlockBegin;
     else
         return mBlockEnd;
-
 }
 
 void SynEdit::setBlockEnd(BufferCoord Value)
@@ -6717,6 +6723,12 @@ void SynEdit::setSelText(const QString &text)
 
 BufferCoord SynEdit::blockBegin() const
 {
+    if (mActiveSelectionMode == SynSelectionMode::smColumn) {
+        return BufferCoord{
+            std::min(mBlockBegin.Char,mBlockEnd.Char),
+            std::min(mBlockBegin.Line,mBlockEnd.Line),
+        };
+    }
     if ((mBlockEnd.Line < mBlockBegin.Line)
       || ((mBlockEnd.Line == mBlockBegin.Line) && (mBlockEnd.Char < mBlockBegin.Char)))
         return mBlockEnd;