diff --git a/include/cmd_parser.h b/include/cmd_parser.h
index 98e7510..1bbabcf 100644
--- a/include/cmd_parser.h
+++ b/include/cmd_parser.h
@@ -35,7 +35,7 @@ public:
 class PackageParser : public ICmdParser {
 public:
     PackageParser() {};
-    ~PackageParser() = default;
+    virtual ~PackageParser() = default;
     uint32_t Parse(int argc, char *argv[]) override;
     const std::vector<std::string> &GetInputs() const;
     const std::string &GetPackageName() const;
@@ -104,7 +104,7 @@ template<class T>
 void CmdParser<T>::ShowUseage()
 {
     std::cout << "This is an OHOS Packaging Tool.\n";
-    std::cout << "Useage:\n";
+    std::cout << "Usage:\n";
     std::cout << TOOL_NAME << " [arguments] Package the OHOS resources.\n";
     std::cout << "[arguments]:\n";
     std::cout << "    -i    input resource path, can add more.\n";
diff --git a/include/file_manager.h b/include/file_manager.h
index c19802e..747cad3 100644
--- a/include/file_manager.h
+++ b/include/file_manager.h
@@ -28,7 +28,7 @@ namespace Restool {
 class FileManager : public Singleton<FileManager> {
 public:
     uint32_t ScanModules(const std::vector<std::string> &inputs, const std::string &output);
-    const std::map<int32_t, std::vector<ResourceItem>> &GetResources() const { return alls_; };
+    const std::map<int32_t, std::vector<ResourceItem>> &GetResources() const { return items_; };
     void SetModuleName(const std::string &moduleName) { moduleName_ = moduleName; };
     uint32_t ScanIncrement(const std::string &output);
 
@@ -42,7 +42,7 @@ private:
         const std::map<ResType, std::vector<DirectoryInfo>> &resTypeOfDirs) const;
 
     // id, resource items
-    std::map<int32_t, std::vector<ResourceItem>> alls_;
+    std::map<int32_t, std::vector<ResourceItem>> items_;
     std::string moduleName_;
 };
 }
diff --git a/include/reference_parser.h b/include/reference_parser.h
index 60e9e8f..b1c3b1e 100644
--- a/include/reference_parser.h
+++ b/include/reference_parser.h
@@ -27,7 +27,7 @@ public:
     ReferenceParser();
     virtual ~ReferenceParser();
     uint32_t ParseRefInSolidXml(const std::vector<std::string> &solidXmlFolders) const;
-    uint32_t ParseRefInElement(std::map<int32_t, std::vector<ResourceItem>> &alls) const;
+    uint32_t ParseRefInElement(std::map<int32_t, std::vector<ResourceItem>> &items) const;
     uint32_t ParseRefInString(std::string &value, bool &update) const;
     uint32_t ParseRefInProfile(const std::string &output) const;
     uint32_t ParseRefInJson(const std::string &filePath) const;
diff --git a/include/resource_util.h b/include/resource_util.h
index f61e752..bbc9a24 100644
--- a/include/resource_util.h
+++ b/include/resource_util.h
@@ -116,7 +116,7 @@ public:
     static bool CopyFleInner(const std::string &src, const std::string &dst);
 
     /**
-     * @brief create directorys
+     * @brief create directories
      * @param filePath: directory path
      * @return true if success, other false
      */
diff --git a/src/file_manager.cpp b/src/file_manager.cpp
index 5a14b0a..5f1795d 100644
--- a/src/file_manager.cpp
+++ b/src/file_manager.cpp
@@ -46,7 +46,7 @@ uint32_t FileManager::ScanModules(const vector<string> &inputs, const string &ou
 uint32_t FileManager::ScanIncrement(const string &output)
 {
     auto &incrementManager = IncrementManager::GetInstance();
-    alls_ = incrementManager.GetResourceItems();
+    items_ = incrementManager.GetResourceItems();
     vector<string> sxmlFolders;
     FilterRefSolidXml(output, sxmlFolders, incrementManager.GetScanDirs());
     return ParseReference(output, sxmlFolders);
@@ -67,14 +67,14 @@ uint32_t FileManager::ScanModule(const string &input, const string &output,
 
 uint32_t FileManager::MergeResourceItem(const map<int32_t, vector<ResourceItem>> &resourceInfos)
 {
-    return ResourceModule::MergeResourceItem(alls_, resourceInfos);
+    return ResourceModule::MergeResourceItem(items_, resourceInfos);
 }
 
 uint32_t FileManager::ParseReference(const string &output, const vector<string> &sxmlFolders)
 {
     ReferenceParser referenceParser;
     if (referenceParser.ParseRefInSolidXml(sxmlFolders) != RESTOOL_SUCCESS ||
-        referenceParser.ParseRefInElement(alls_) != RESTOOL_SUCCESS ||
+        referenceParser.ParseRefInElement(items_) != RESTOOL_SUCCESS ||
         referenceParser.ParseRefInProfile(output) != RESTOOL_SUCCESS) {
         return RESTOOL_ERROR;
     }
diff --git a/src/reference_parser.cpp b/src/reference_parser.cpp
index 7467382..c799eec 100644
--- a/src/reference_parser.cpp
+++ b/src/reference_parser.cpp
@@ -87,9 +87,9 @@ uint32_t ReferenceParser::ParseRefInSolidXml(const vector<string> &solidXmlFolde
     return RESTOOL_SUCCESS;
 }
 
-uint32_t ReferenceParser::ParseRefInElement(map<int32_t, vector<ResourceItem>> &alls) const
+uint32_t ReferenceParser::ParseRefInElement(map<int32_t, vector<ResourceItem>> &items) const
 {
-    for (auto &iter : alls) {
+    for (auto &iter : items) {
         for (auto &resourceItem : iter.second) {
             if (IsNotElement(resourceItem.GetResType())) {
                 break;
diff --git a/src/resource_util.cpp b/src/resource_util.cpp
index 3fcc3fc..deb0815 100644
--- a/src/resource_util.cpp
+++ b/src/resource_util.cpp
@@ -75,7 +75,7 @@ bool ResourceUtil::OpenJsonFile(const string &path, Json::Value &root)
 {
     ifstream ifs(path, ios::binary);
     if (!ifs) {
-        cerr << "Error: open json faild '" << path << "'" << endl;
+        cerr << "Error: open json failed '" << path << "'" << endl;
         return false;
     }
 
diff --git a/src/restool.cpp b/src/restool.cpp
index 135ed98..85e780d 100644
--- a/src/restool.cpp
+++ b/src/restool.cpp
@@ -33,6 +33,10 @@ uint32_t PackCmdHandle(PackageParser &packageParser)
 
 int main(int argc, char *argv[])
 {
+    if (argv == nullptr) {
+        cerr << "Error: argv null" << endl;
+        return RESTOOL_ERROR;
+    }
     auto &parser = CmdParser<PackageParser>::GetInstance();
     if (parser.Parse(argc, argv) != RESTOOL_SUCCESS) {
         parser.ShowUseage();
diff --git a/src/xml/solid_xml.cpp b/src/xml/solid_xml.cpp
index c1fbee7..bd7f9f6 100644
--- a/src/xml/solid_xml.cpp
+++ b/src/xml/solid_xml.cpp
@@ -43,9 +43,14 @@ bool SolidXml::GenerateSolidXml(const string &filePath)
         return false;
     }
 
+    xmlNodePtr rootNode = xmlDocGetRootElement(doc);
+    if (rootNode == nullptr) {
+        xmlFreeDoc(doc);
+        return false;
+    }
     auto root = make_shared<XmlNode>();
     nodes_.push_back(root);
-    Compile(xmlDocGetRootElement(doc), root);
+    Compile(rootNode, root);
     xmlFreeDoc(doc);
     return SaveToFile(filePath);
 }