diff --git a/libWords/libwords.cpp b/libWords/libwords.cpp
index c9409af..344359d 100644
--- a/libWords/libwords.cpp
+++ b/libWords/libwords.cpp
@@ -5,12 +5,12 @@
 using namespace lib_words;
 
 
-std::shared_ptr<const IWordBase> WordReader::wordsFrom(const QString& path) const {
+std::shared_ptr<const IPrimitiveWord> WordReader::wordsFrom(const QString& path) const {
 	auto primary_words = extract_primary(path);
 	if (!primary_words.size())
 		return nullptr;
 
-	std::shared_ptr<const IWordBase> prev_ptr = std::make_shared<const WordImpl>(primary_words.last(), nullptr);
+	std::shared_ptr<const IPrimitiveWord> prev_ptr = std::make_shared<const WordImpl>(primary_words.last(), nullptr);
 	for (auto idx = primary_words.size() - 2; idx >= 0; --idx) {
 		auto content_ptr = primary_words[idx];
 		prev_ptr = std::make_shared<const WordImpl>(content_ptr, prev_ptr);
@@ -58,7 +58,7 @@ QList<std::shared_ptr<const IWordBase>> WordReader::parse_line(uint64_t start_po
 	return primary_words;
 }
 
-WordImpl::WordImpl(std::shared_ptr<const IWordBase> content, std::shared_ptr<const IWordBase> next)
+WordImpl::WordImpl(std::shared_ptr<const IWordBase> content, std::shared_ptr<const IPrimitiveWord> next)
 	: content_ptr(content), next_ptr(next) { }
 
 QString WordImpl::file() const {
@@ -81,7 +81,7 @@ int WordImpl::column() const {
 	return content_ptr->column();
 }
 
-std::shared_ptr<const IWordBase> WordImpl::nextWord() const {
+std::shared_ptr<const IPrimitiveWord> WordImpl::nextWord() const {
 	return next_ptr;
 }
 
@@ -116,6 +116,6 @@ int WordContent::column() const {
 	return col_n;
 }
 
-std::shared_ptr<const IWordBase> WordContent::nextWord() const {
+std::shared_ptr<const IPrimitiveWord> WordContent::nextWord() const {
 	return nullptr;
 }
diff --git a/libWords/libwords.h b/libWords/libwords.h
index feadea0..562faea 100644
--- a/libWords/libwords.h
+++ b/libWords/libwords.h
@@ -45,7 +45,7 @@ namespace lib_words {
 		 *
 		 * \return
 		 */
-		virtual std::shared_ptr<const IWordBase> nextWord() const = 0;
+		virtual std::shared_ptr<const IPrimitiveWord> nextWord() const = 0;
 	};
 
 	/**
@@ -67,16 +67,16 @@ namespace lib_words {
 		virtual QString content() const override;
 		virtual int row() const override;
 		virtual int column() const override;
-		virtual std::shared_ptr<const IWordBase> nextWord() const override;
+		virtual std::shared_ptr<const IPrimitiveWord> nextWord() const override;
 	};
 
 	class LIBWORDS_EXPORT WordImpl : public IPrimitiveWord {
 	private:
 		std::shared_ptr<const IWordBase> content_ptr;
-		std::shared_ptr<const IWordBase> next_ptr;
+		std::shared_ptr<const IPrimitiveWord> next_ptr;
 
 	public:
-		WordImpl(std::shared_ptr<const IWordBase> content, std::shared_ptr<const IWordBase> next);
+		WordImpl(std::shared_ptr<const IWordBase> content, std::shared_ptr<const IPrimitiveWord> next);
 
 		// 通过 IWordBase 继承
 		QString file() const override;
@@ -84,7 +84,7 @@ namespace lib_words {
 		QString content() const override;
 		int row() const override;
 		int column() const override;
-		std::shared_ptr<const IWordBase> nextWord() const override;
+		std::shared_ptr<const IPrimitiveWord> nextWord() const override;
 	};
 
 
@@ -100,7 +100,7 @@ namespace lib_words {
 		/**
 		* @brief 提取源码中所有的词语
 		*/
-		std::shared_ptr<const IWordBase> wordsFrom(const QString& path) const;
+		std::shared_ptr<const IPrimitiveWord> wordsFrom(const QString& path) const;
 	};