diff --git a/src/Scanner.cpp b/src/Scanner.cpp
index 7387059..fd290c6 100644
--- a/src/Scanner.cpp
+++ b/src/Scanner.cpp
@@ -1,5 +1,6 @@
 #include "Scanner.h"
 #include <sstream>
+#include <cctype>
 
 int Scanner::process_const_table(int index) {
     return 0;
@@ -34,7 +35,45 @@ int Scanner::process_identifier_table(int index) {
 }
 
 int Scanner::process_key_table(int index) {
-    return 0;
+    int max_len = 0;
+    int found_key = -1; // 存储找到的关键字编号
+
+    // 遍历关键字表
+    for (const auto& pair : m_tables.KeyTable) {
+        const std::string& keyword = pair.second;
+        int len = keyword.length();
+
+        // 检查剩余长度是否足够
+        if (index + len > m_source_code.length()) {
+            continue;
+        }
+
+        // 比较子串是否匹配关键字
+        if (m_source_code.substr(index, len) == keyword) {
+            // 检查关键字后是否紧跟字母/数字/下划线
+            if (index + len < m_source_code.length()) {
+                char next_char = m_source_code[index + len];
+                if (isalnum(next_char) || next_char == '_') {
+                    continue; // 是标识符的一部分，跳过
+                }
+            }
+
+            // 更新最长匹配（解决"float32"和"float64"的冲突）
+            if (len > max_len) {
+                max_len = len;
+                found_key = pair.first;
+            }
+        }
+    }
+
+    // 找到有效关键字
+    if (max_len > 0) {
+        Token token({ found_key, KEY_TABLE });
+        m_token_list.push_back(token);
+        return max_len;
+    }
+
+    return 0; // 未识别到关键字
 }
 
 int Scanner::process_punct_table(int index) {
diff --git a/unit/scanner_test.cpp b/unit/scanner_test.cpp
index 1246e77..47e7119 100644
--- a/unit/scanner_test.cpp
+++ b/unit/scanner_test.cpp
@@ -5,7 +5,7 @@
 #include "Tbs.h"
 #include <vector>
 using std::string,std::vector;
-
+//
 TEST_CASE("Scanner test identifier table") {
     Tbs tables;
     std::string src = "abcvljl laadfs fafarwrw";
@@ -27,4 +27,15 @@ TEST_CASE("Scanner test Punct table") {
     for (auto e : scan.get_token_list()) {
         std::cout<<e.id<<" "<<e.type<<" "<<tables.PunctTable[e.id]<<"\n";
     }
+}
+
+TEST_CASE("Scanner test key table") {
+    Tbs tables = {};
+    std::string src = "i32";
+    Scanner scan(src, tables);
+    scan.scan();
+    std::cout<<"test\n";
+    for (auto e : scan.get_token_list()) {
+        std::cout<<e.id<<" "<<e.type <<"\n";
+    }
 }
\ No newline at end of file