diff --git a/src/utils/vvim.cpp b/src/utils/vvim.cpp
index 940b08a8..befb19c2 100644
--- a/src/utils/vvim.cpp
+++ b/src/utils/vvim.cpp
@@ -18,6 +18,7 @@ extern VConfigManager *g_config;
 const QChar VVim::c_unnamedRegister = QChar('"');
 const QChar VVim::c_blackHoleRegister = QChar('_');
 const QChar VVim::c_selectionRegister = QChar('+');
+QMap<QChar, VVim::Register> VVim::s_registers;
 
 const int VVim::SearchHistory::c_capacity = 50;
 
@@ -556,7 +557,7 @@ bool VVim::handleKeyPressEvent(int key, int modifiers, int *p_autoIndentPos)
             QChar reg = keyToRegisterName(keyInfo);
             if (!reg.isNull()) {
                 // Insert register content.
-                m_editor->insertPlainText(m_registers[reg].read());
+                m_editor->insertPlainText(getRegister(reg).read());
             }
 
             goto clear_accept;
@@ -602,11 +603,12 @@ bool VVim::handleKeyPressEvent(int key, int modifiers, int *p_autoIndentPos)
         QChar reg = keyToRegisterName(keyInfo);
         if (!reg.isNull()) {
             m_keys.clear();
-            setRegister(reg);
-            if (m_registers[reg].isNamedRegister()) {
-                m_registers[reg].m_append = (modifiers == Qt::ShiftModifier);
+            setCurrentRegisterName(reg);
+            Register &r = getRegister(reg);
+            if (r.isNamedRegister()) {
+                r.m_append = (modifiers == Qt::ShiftModifier);
             } else {
-                Q_ASSERT(!m_registers[reg].m_append);
+                Q_ASSERT(!r.m_append);
             }
 
             goto accept;
@@ -2223,7 +2225,7 @@ void VVim::resetState()
     m_keys.clear();
     m_tokens.clear();
     m_pendingKeys.clear();
-    setRegister(c_unnamedRegister);
+    setCurrentRegisterName(c_unnamedRegister);
     m_resetPositionInBlock = true;
     m_registerPending = false;
 }
@@ -3881,7 +3883,7 @@ void VVim::processPasteAction(QList<Token> &p_tokens, bool p_pasteBefore)
         repeat = to.m_repeat;
     }
 
-    Register &reg = m_registers[m_regName];
+    Register &reg = getRegister(m_regName);
     QString value = reg.read();
     bool isBlock = reg.isBlock();
     if (value.isEmpty()) {
@@ -4855,14 +4857,17 @@ void VVim::expandSelectionToWholeLines(QTextCursor &p_cursor)
 
 void VVim::initRegisters()
 {
-    m_registers.clear();
-    for (char ch = 'a'; ch <= 'z'; ++ch) {
-        m_registers[QChar(ch)] = Register(QChar(ch));
+    if (!s_registers.isEmpty()) {
+        return;
     }
 
-    m_registers[c_unnamedRegister] = Register(c_unnamedRegister);
-    m_registers[c_blackHoleRegister] = Register(c_blackHoleRegister);
-    m_registers[c_selectionRegister] = Register(c_selectionRegister);
+    for (char ch = 'a'; ch <= 'z'; ++ch) {
+        s_registers[QChar(ch)] = Register(QChar(ch));
+    }
+
+    s_registers[c_unnamedRegister] = Register(c_unnamedRegister);
+    s_registers[c_blackHoleRegister] = Register(c_blackHoleRegister);
+    s_registers[c_selectionRegister] = Register(c_selectionRegister);
 }
 
 bool VVim::expectingRegisterName() const
@@ -5145,12 +5150,12 @@ void VVim::saveToRegister(const QString &p_text)
 
     qDebug() << QString("save text(%1) to register(%2)").arg(text).arg(m_regName);
 
-    Register &reg = m_registers[m_regName];
+    Register &reg = getRegister(m_regName);
     reg.update(text);
 
     if (!reg.isBlackHoleRegister() && !reg.isUnnamedRegister()) {
         // Save it to unnamed register.
-        m_registers[c_unnamedRegister].update(reg.m_value);
+        setRegister(c_unnamedRegister, reg.m_value);
     }
 }
 
@@ -5257,7 +5262,7 @@ void VVim::message(const QString &p_msg)
 
 const QMap<QChar, VVim::Register> &VVim::getRegisters() const
 {
-    return m_registers;
+    return s_registers;
 }
 
 const VVim::Marks &VVim::getMarks() const
@@ -5280,7 +5285,7 @@ QString VVim::getPendingKeys() const
     return str;
 }
 
-void VVim::setRegister(QChar p_reg)
+void VVim::setCurrentRegisterName(QChar p_reg)
 {
     m_regName = p_reg;
 }
@@ -5793,7 +5798,7 @@ QString VVim::readRegister(int p_key, int p_modifiers)
     Key keyInfo(p_key, p_modifiers);
     QChar reg = keyToRegisterName(keyInfo);
     if (!reg.isNull()) {
-        return m_registers[reg].read();
+        return getRegister(reg).read();
     }
 
     return "";
diff --git a/src/utils/vvim.h b/src/utils/vvim.h
index 69973e8f..7101d7c0 100644
--- a/src/utils/vvim.h
+++ b/src/utils/vvim.h
@@ -166,7 +166,7 @@ public:
     void setMode(VimMode p_mode, bool p_clearSelection = true);
 
     // Set current register.
-    void setRegister(QChar p_reg);
+    void setCurrentRegisterName(QChar p_reg);
 
     // Get m_registers.
     const QMap<QChar, Register> &getRegisters() const;
@@ -797,6 +797,10 @@ private:
     // Clear search highlight.
     void clearSearchHighlight();
 
+    // Function utils for register.
+    Register &getRegister(QChar p_regName) const;
+    void setRegister(QChar p_regName, const QString &p_val);
+
     VEdit *m_editor;
     const VEditConfig *m_editConfig;
     VimMode m_mode;
@@ -814,8 +818,6 @@ private:
     // Whether reset the position in block when moving cursor.
     bool m_resetPositionInBlock;
 
-    QMap<QChar, Register> m_registers;
-
     // Currently used register.
     QChar m_regName;
 
@@ -843,6 +845,18 @@ private:
     static const QChar c_unnamedRegister;
     static const QChar c_blackHoleRegister;
     static const QChar c_selectionRegister;
+
+    static QMap<QChar, VVim::Register> s_registers;
 };
 
+inline VVim::Register &VVim::getRegister(QChar p_regName) const
+{
+    return s_registers[p_regName];
+}
+
+inline void VVim::setRegister(QChar p_regName, const QString &p_val)
+{
+    s_registers[p_regName].update(p_val);
+}
+
 #endif // VVIM_H