diff --git a/libc-test/src/functionalext/supplement/ctype/isalpha.c b/libc-test/src/functionalext/supplement/ctype/isalpha.c
index 5f17e99f1d71de791e6d306b49ffd9e8a34becad..74043fecfc918d6cede5f45288437c051cda88ff 100644
--- a/libc-test/src/functionalext/supplement/ctype/isalpha.c
+++ b/libc-test/src/functionalext/supplement/ctype/isalpha.c
@@ -79,6 +79,47 @@ void isalpha_0500(void)
     EXPECT_EQ("isalpha_0500", total, 52);
 }
 
+/**
+ * @tc.name      : isalpha_0600
+ * @tc.desc      : Verify all the letters in the ASCII code table
+ * @tc.level     : Level 1
+ */
+void isalpha_0600(void)
+{
+    for (int i = 65; i < 91; i++) {
+        int ret = isalpha((char)i);
+        EXPECT_NE("isalpha_0600", ret, COUNT_ZERO);
+    }
+
+    for (int i = 97; i < 123; i++) {
+        int ret = isalpha((char)i);
+        EXPECT_NE("isalpha_0600", ret, COUNT_ZERO);
+    }
+}
+
+/**
+ * @tc.name      : isalpha_0700
+ * @tc.desc      : Verify all non-alphabetic characters in the ASCII code table
+ * @tc.level     : Level 1
+ */
+void isalpha_0700(void)
+{
+    for (int i = 0; i < 65; i++) {
+        int ret = isalpha((char)i);
+        EXPECT_EQ("isalpha_0700", ret, COUNT_ZERO);
+    }
+
+    for (int i = 91; i < 97; i++) {
+        int ret = isalpha((char)i);
+        EXPECT_EQ("isalpha_0700", ret, COUNT_ZERO);
+    }
+
+    for (int i = 123; i < 128; i++) {
+        int ret = isalpha((char)i);
+        EXPECT_EQ("isalpha_0700", ret, COUNT_ZERO);
+    }
+}
+
 int main(void)
 {
     isalpha_0100();
@@ -86,5 +127,7 @@ int main(void)
     isalpha_0300();
     isalpha_0400();
     isalpha_0500();
+    isalpha_0600();
+    isalpha_0700();
     return t_status;
 }
\ No newline at end of file
diff --git a/libc-test/src/functionalext/supplement/ctype/isascii.c b/libc-test/src/functionalext/supplement/ctype/isascii.c
index d918ac00856ceaf7b40d145758a9d580262c3d89..5ae8c4571742d1f29dd052f88ece4b8bf87f74f9 100755
--- a/libc-test/src/functionalext/supplement/ctype/isascii.c
+++ b/libc-test/src/functionalext/supplement/ctype/isascii.c
@@ -37,8 +37,22 @@ void isascii_0100(void)
     }
 }
 
+/**
+ * @tc.name      : isascii_0200
+ * @tc.desc      : Test all ASCII code characters
+ * @tc.level     : Level 1
+ */
+void isascii_0200(void)
+{
+    for (int i = 0; i < 128; i++) {
+        int ret = isascii((char)i);
+        EXPECT_EQ("isascii_0200", ret, ONREXPECT);
+    }
+}
+
 int main(void)
 {
     isascii_0100();
+    isascii_0200();
     return t_status;
 }
\ No newline at end of file
diff --git a/libc-test/src/functionalext/supplement/ctype/tolower.c b/libc-test/src/functionalext/supplement/ctype/tolower.c
index ee77d943cc9b24660886fbbda69ea744f7854a2c..2594eb80e7acfd7cdf84f31530c71a4a83cb7415 100644
--- a/libc-test/src/functionalext/supplement/ctype/tolower.c
+++ b/libc-test/src/functionalext/supplement/ctype/tolower.c
@@ -14,6 +14,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <ctype.h>
 #include "test.h"
 
@@ -73,11 +74,89 @@ void tolower_0400(void)
     }
 }
 
+/**
+ * @tc.name      : tolower_0500
+ * @tc.desc      : Test the result of passing whitespace character into tolower
+ * @tc.level     : Level 2
+ */
+void tolower_0500(void)
+{
+    char ch = ' ';
+    char result = tolower(ch);
+    if (result != ch) {
+        t_error("%s tolower get result is %c but want get value %c ", __func__, result, ch);
+    }
+}
+
+/**
+ * @tc.name      : tolower_0600
+ * @tc.desc      : Test the result of passing all lowercase characters into tolower
+ * @tc.level     : Level 2
+ */
+void tolower_0600(void)
+{
+    char str1[] = "helloworld";
+    size_t sizeStr = sizeof(str1);
+    char str2[sizeStr];
+    for (int i = 0; str1[i]; i++) {
+        str2[i] = tolower(str1[i]);
+    }
+    char wantStr[] = "helloworld";
+    int result = strcmp(wantStr, str2);
+    if (result != 0) {
+        t_error("%s tolower get str2 is %s but want get value %s ", __func__, str2, wantStr);
+    }
+}
+
+/**
+ * @tc.name      : tolower_0700
+ * @tc.desc      : Test the result of passing all uppercase characters into tolower
+ * @tc.level     : Level 2
+ */
+void tolower_0700(void)
+{
+    char str1[] = "HELLOWORLD";
+    size_t sizeStr = sizeof(str1);
+    char str2[sizeStr];
+    for (int i = 0; str1[i]; i++) {
+        str2[i] = tolower(str1[i]);
+    }
+    char wantStr[] = "helloworld";
+    int result = strcmp(wantStr, str2);
+    if (result != 0) {
+        t_error("%s tolower get str2 is %s but want get value %s ", __func__, str2, wantStr);
+    }
+}
+
+/**
+ * @tc.name      : tolower_0800
+ * @tc.desc      : Test the result of passing Uncertain characters into tolower
+ * @tc.level     : Level 2
+ */
+void tolower_0800(void)
+{
+    char str1[] = "Hello world!";
+    size_t sizeStr = sizeof(str1);
+    char str2[sizeStr];
+    for (int i = 0; str1[i]; i++) {
+        str2[i] = tolower(str1[i]);
+    }
+    char wantStr[] = "hello world!";
+    int result = strcmp(wantStr, str2);
+    if (result != 0) {
+        t_error("%s tolower get str2 is %s but want get value %s ", __func__, str2, wantStr);
+    }
+}
+
 int main(int argc, char *argv[])
 {
     tolower_0100();
     tolower_0200();
     tolower_0300();
     tolower_0400();
+    tolower_0500();
+    tolower_0600();
+    tolower_0700();
+    tolower_0800();
     return t_status;
 }
\ No newline at end of file
diff --git a/libc-test/src/functionalext/supplement/ctype/toupper.c b/libc-test/src/functionalext/supplement/ctype/toupper.c
index 55608807819b633c2d6303688f8e721c78435ea5..72638da4634d25191103e8465bf2634ab4594c31 100644
--- a/libc-test/src/functionalext/supplement/ctype/toupper.c
+++ b/libc-test/src/functionalext/supplement/ctype/toupper.c
@@ -14,6 +14,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 #include <ctype.h>
 #include "test.h"
 
@@ -73,11 +74,89 @@ void toupper_0400(void)
     }
 }
 
+/**
+ * @tc.name      : toupper_0500
+ * @tc.desc      : Test the result of passing whitespace character into toupper
+ * @tc.level     : Level 2
+ */
+void toupper_0500(void)
+{
+    char ch = ' ';
+    char result = toupper(ch);
+    if (result != ch) {
+        t_error("%s toupper get result is %c but want get value %c ", __func__, result, ch);
+    }
+}
+
+/**
+ * @tc.name      : toupper_0600
+ * @tc.desc      : Test the result of passing all lowercase characters into toupper
+ * @tc.level     : Level 2
+ */
+void toupper_0600(void)
+{
+    char str1[] = "helloworld";
+    size_t sizeStr = sizeof(str1);
+    char str2[sizeStr];
+    for (int i = 0; str1[i]; i++) {
+        str2[i] = toupper(str1[i]);
+    }
+    char wantStr[] = "HELLOWORLD";
+    int result = strcmp(wantStr, str2);
+    if (result != 0) {
+        t_error("%s toupper get str2 is %s but want get value %s ", __func__, str2, wantStr);
+    }
+}
+
+/**
+ * @tc.name      : toupper_0700
+ * @tc.desc      : Test the result of passing all uppercase characters into toupper
+ * @tc.level     : Level 2
+ */
+void toupper_0700(void)
+{
+    char str1[] = "HELLOWORLD";
+    size_t sizeStr = sizeof(str1);
+    char str2[sizeStr];
+    for (int i = 0; str1[i]; i++) {
+        str2[i] = toupper(str1[i]);
+    }
+    char wantStr[] = "HELLOWORLD";
+    int result = strcmp(wantStr, str2);
+    if (result != 0) {
+        t_error("%s toupper get str2 is %s but want get value %s ", __func__, str2, wantStr);
+    }
+}
+
+/**
+ * @tc.name      : toupper_0800
+ * @tc.desc      : Test the result of passing Uncertain characters into toupper
+ * @tc.level     : Level 2
+ */
+void toupper_0800(void)
+{
+    char str1[] = "Hello world!";
+    size_t sizeStr = sizeof(str1);
+    char str2[sizeStr];
+    for (int i = 0; str1[i]; i++) {
+        str2[i] = toupper(str1[i]);
+    }
+    char wantStr[] = "HELLO WORLD!";
+    int result = strcmp(wantStr, str2);
+    if (result != 0) {
+        t_error("%s toupper get str2 is %s but want get value %s ", __func__, str2, wantStr);
+    }
+}
+
 int main(int argc, char *argv[])
 {
     toupper_0100();
     toupper_0200();
     toupper_0300();
     toupper_0400();
+    toupper_0500();
+    toupper_0600();
+    toupper_0700();
+    toupper_0800();
     return t_status;
 }
\ No newline at end of file