diff --git a/honoka/src/honoka_imengine.cpp b/honoka/src/honoka_imengine.cpp
index 6820b9d..69ba8ea 100644
--- a/honoka/src/honoka_imengine.cpp
+++ b/honoka/src/honoka_imengine.cpp
@@ -195,6 +195,9 @@
     DIR *dir = opendir(HONOKA_PLUGINDIR);
     if (dir) {
         struct dirent *entry;
+        //
+        // �ץ饰�����ɤ߹�����ʬ��
+        //
         while((entry = readdir(dir)) != NULL) {
             String d = entry->d_name;
             if ((d.substr(0,6) == "plugin") && (d.substr(d.length() - 3,3) == ".so")) {
@@ -212,11 +215,22 @@
                 }
                 if (getPluginVersion() == HONOKA_PLUGIN_VERSION) {
                     HonokaPluginBase *p = getInstance(_scim_config);
+                    HonokaPluginEntry pe;
+                    pe.filename = d;
+                    pe.createInstance = getInstance;
+                    pe.deleteInstance = deleteInstance;
+                    pe.getPluginVersion = getPluginVersion;
+                    if (plugins.find(p->getName()) != plugins.end()) {
+                        deleteInstance(p);
+                        dlclose(plugin);
+                    } else 
                     if (p->getPluginType() == "Convertor") {
                         convertors.push_back(static_cast<Convertor *>(p));
+                        plugins.insert(pair<String,HonokaPluginEntry>(p->getName(),pe));
                     } else
                     if (p->getPluginType() == "PreEditor") {
                         preeditors.push_back(static_cast<PreEditor *>(p));
+                        plugins.insert(pair<String,HonokaPluginEntry>(p->getName(),pe));
                     } else {
                         deleteInstance(p);
                         dlclose(plugin);
diff --git a/honoka/src/honoka_imengine.h b/honoka/src/honoka_imengine.h
index d110fa8..907db93 100644
--- a/honoka/src/honoka_imengine.h
+++ b/honoka/src/honoka_imengine.h
@@ -30,6 +30,7 @@
 #include <cstdlib>
 #include <vector>
 #include <stack>
+#include <map>
 #include <convertor.h>
 #include <preeditor.h>
 #define Uses_SCIM_ICONV
@@ -72,6 +73,15 @@
     bool comp(const KeyEvent &k);
 };
 
+class HonokaPluginEntry
+{
+public:
+    String filename;
+    createInstanceFunc *createInstance;
+    deleteInstanceFunc *deleteInstance;
+    getPluginVersionFunc *getPluginVersion;
+};
+
 
 class HonokaInstance : public IMEngineInstanceBase
 {
@@ -108,6 +118,7 @@
     bool auto_conversion;
     String defaultPreEditor;
     IConvert m_iconv;
+    map<String,HonokaPluginEntry> plugins;
     vector<PreEditor *> preeditors;
     vector<Convertor *> convertors;
     String sType;
diff --git a/honoka/src/honokapluginbase.cpp b/honoka/src/honokapluginbase.cpp
index 0506355..50586ec 100644
--- a/honoka/src/honokapluginbase.cpp
+++ b/honoka/src/honokapluginbase.cpp
@@ -35,3 +35,8 @@
     return type;
 }
 
+String HonokaPluginBase::getName()
+{
+    return String("PluginBase");
+}
+
diff --git a/honoka/src/honokapluginbase.h b/honoka/src/honokapluginbase.h
index 169f0ad..509a61a 100644
--- a/honoka/src/honokapluginbase.h
+++ b/honoka/src/honokapluginbase.h
@@ -51,6 +51,7 @@
 public:
     
     String getPluginType();
+    virtual String getName();
 
 private:
     String type;