diff --git a/L2_Core/utils/inc/ek_str.h b/L2_Core/utils/inc/ek_str.h
new file mode 100644
index 0000000..b6f120e
--- /dev/null
+++ b/L2_Core/utils/inc/ek_str.h
@@ -0,0 +1,39 @@
+#ifndef EK_STR_H
+#define EK_STR_H
+
+#include "../../../ek_conf.h"
+
+#if EK_STR_ENABLE == 1
+
+#    include "ek_def.h"
+
+typedef struct ek_str_t ek_str_t;
+
+struct ek_str_t
+{
+    char *buf;
+    uint32_t cap;
+    uint32_t len;
+};
+
+ek_str_t *ek_str_create(const char *str);
+void ek_str_free(ek_str_t *s);
+void ek_str_clear(ek_str_t *s);
+
+bool ek_str_append_len(ek_str_t *s, const char *str, uint32_t len);
+bool ek_str_append(ek_str_t *s, const char *str);
+bool ek_str_append_fmt(ek_str_t *s, const char *fmt, ...);
+
+bool ek_str_cat(ek_str_t *dst, ek_str_t *src);
+ek_str_t *ek_str_slice(const ek_str_t *s, int32_t start, int32_t end);
+const char *ek_str_get_cstring(ek_str_t *s);
+
+uint32_t ek_str_get_len(ek_str_t *s);
+uint32_t ek_str_get_cap(ek_str_t *s);
+
+int ek_str_cmp(ek_str_t *s1, ek_str_t *s2);
+int ek_str_ncmp(ek_str_t *s1, ek_str_t *s2, size_t n);
+
+#endif // EK_STR_ENABLE
+
+#endif // EK_STR_H
diff --git a/L2_Core/utils/src/ek_str.c b/L2_Core/utils/src/ek_str.c
new file mode 100644
index 0000000..18e71b7
--- /dev/null
+++ b/L2_Core/utils/src/ek_str.c
@@ -0,0 +1,211 @@
+#include "../inc/ek_str.h"
+
+#if EK_STR_ENABLE == 1
+
+#    include "../inc/ek_io.h"
+#    include "../inc/ek_mem.h"
+#    include "../inc/ek_assert.h"
+
+#    define INDEX_CLAMP(idx, len)             \
+        do                                    \
+        {                                     \
+            if ((idx) < 0) (idx) += (len);    \
+            if ((idx) < 0) (idx) = 0;         \
+            if ((idx) > (len)) (idx) = (len); \
+        } while (0)
+
+static bool _ek_str_ensure_cap(ek_str_t *s, uint32_t len)
+{
+    ek_assert_tiny(s != NULL);
+
+    if (s->cap >= len) return true;
+
+    uint32_t new_cap = s->cap;
+    do
+    {
+        if (new_cap == 0) new_cap = 2;
+        new_cap += new_cap / 2;
+    } while (new_cap < len);
+
+    char *buf = NULL;
+
+    if (s->buf == NULL) buf = ek_malloc(len);
+    else buf = ek_realloc(s->buf, new_cap);
+
+    if (buf == NULL) return false;
+
+    s->buf = buf;
+    s->cap = new_cap;
+
+    return true;
+}
+
+ek_str_t *ek_str_create(const char *str)
+{
+    ek_str_t *s = ek_malloc(sizeof(ek_str_t));
+    if (s == NULL) return NULL;
+
+    s->buf = NULL;
+    s->cap = 0;
+    s->len = 0;
+
+    // 传入 NULL 则创建一个空的字符串
+    if (str == NULL) return s;
+
+    if (ek_str_append(s, str) == false)
+    {
+        ek_free(s);
+        return NULL;
+    }
+
+    return s;
+}
+
+void ek_str_free(ek_str_t *s)
+{
+    ek_assert_tiny(s != NULL);
+
+    s->cap = 0;
+    s->len = 0;
+    ek_free(s->buf);
+    ek_free(s);
+}
+
+void ek_str_clear(ek_str_t *s)
+{
+    ek_assert_tiny(s != NULL);
+
+    s->len = 0;
+}
+
+bool ek_str_append_len(ek_str_t *s, const char *str, uint32_t len)
+{
+    ek_assert_tiny(s != NULL);
+
+    // 如果传入追加内容为空，并且字符长度也为空
+    // 什么也不做
+    if (str == NULL && len == 0) return true;
+
+    ek_assert_tiny(str != NULL);
+    ek_assert_tiny(len != 0);
+
+    if (_ek_str_ensure_cap(s, s->len + len + 1) == false) return false;
+    memcpy(s->buf + s->len, str, len);
+
+    s->len += len;
+    s->buf[s->len] = '\0';
+
+    return true;
+}
+
+bool ek_str_append_fmt(ek_str_t *s, const char *fmt, ...)
+{
+    ek_assert_tiny(s != NULL);
+
+    // 获取格式化字符串的长度
+    va_list args;
+    va_start(args, fmt);
+    int len = lwvsnprintf(NULL, 0, fmt, args);
+    va_end(args);
+
+    if (len < 0) return false;
+
+    if (_ek_str_ensure_cap(s, s->len + len) == false) return false;
+
+    va_start(args, fmt);
+    // +1 给 \0
+    lwvsnprintf(s->buf + s->len, len + 1, fmt, args);
+    va_end(args);
+
+    s->len += len;
+    s->buf[s->len] = '\0';
+
+    return true;
+}
+
+bool ek_str_append(ek_str_t *s, const char *str)
+{
+    return ek_str_append_len(s, str, strlen(str));
+}
+
+bool ek_str_cat(ek_str_t *dst, ek_str_t *src)
+{
+    return ek_str_append_len(dst, src->buf, src->len);
+}
+
+ek_str_t *ek_str_slice(const ek_str_t *s, int32_t start, int32_t end)
+{
+    ek_assert_tiny(s != NULL);
+
+    int32_t len = (int32_t)s->len;
+
+    INDEX_CLAMP(start, len);
+    INDEX_CLAMP(end, len);
+
+    if (start == end) return ek_str_create("");
+
+    uint32_t new_len = (uint32_t)(end - start);
+
+    ek_str_t *new_s = ek_str_create(NULL);
+    if (new_s == NULL) return NULL;
+
+    new_s->buf = ek_malloc(new_len + 1);
+    if (new_s->buf == NULL)
+    {
+        ek_free(new_s);
+        return NULL;
+    }
+
+    memcpy(new_s->buf, s->buf + start, new_len);
+    new_s->len = new_len;
+    new_s->cap = new_len;
+    new_s->buf[new_s->len] = '\0';
+
+    return new_s;
+}
+
+const char *ek_str_get_cstring(ek_str_t *s)
+{
+    ek_assert_tiny(s != NULL);
+    if (s->buf == NULL) return "";
+    return s->buf;
+}
+
+uint32_t ek_str_get_len(ek_str_t *s)
+{
+    ek_assert_tiny(s != NULL);
+
+    return s->len;
+}
+
+uint32_t ek_str_get_cap(ek_str_t *s)
+{
+    ek_assert_tiny(s != NULL);
+
+    return s->cap;
+}
+
+int ek_str_cmp(ek_str_t *s1, ek_str_t *s2)
+{
+    ek_assert_tiny(s1 != NULL);
+    ek_assert_tiny(s2 != NULL);
+
+    return strcmp(ek_str_get_cstring(s1), ek_str_get_cstring(s2));
+}
+
+int ek_str_ncmp(ek_str_t *s1, ek_str_t *s2, size_t n)
+{
+    ek_assert_tiny(s1 != NULL);
+    ek_assert_tiny(s2 != NULL);
+
+    uint32_t len1 = ek_str_get_len(s1);
+    uint32_t len2 = ek_str_get_len(s2);
+
+    uint32_t shorter_len = (len1 <= len2) ? len1 : len2;
+
+    if (n > shorter_len) n = shorter_len;
+
+    return strncmp(ek_str_get_cstring(s1), ek_str_get_cstring(s2), n);
+}
+
+#endif // EK_STR_ENABLE
diff --git a/Test/main.c b/Test/main.c
index 87e5b18..2fdfd85 100644
--- a/Test/main.c
+++ b/Test/main.c
@@ -31,6 +31,7 @@ int main(void)
     stack_test();
     ringbuf_test();
     vec_test();
+    str_test();
 
     return 0;
 }
diff --git a/Test/str_test.c b/Test/str_test.c
new file mode 100644
index 0000000..bbca161
--- /dev/null
+++ b/Test/str_test.c
@@ -0,0 +1,56 @@
+#include "test.h"
+
+EK_LOG_FILE_TAG("str_test.c");
+
+void str_test(void)
+{
+    EK_LOG_INFO("str test start");
+
+    EK_LOG_INFO("make an empty str");
+    ek_str_t *s = ek_str_create(NULL);
+    EK_LOG_INFO("s:%s", ek_str_get_cstring(s));
+    EK_LOG_INFO("before free:%zu used:%zu", ek_heap_unused(), ek_heap_used());
+    ek_str_free(s);
+    EK_LOG_INFO("after free:%zu, used:%zu", ek_heap_unused(), ek_heap_used());
+
+    const char *i_am_a_string = "i am a string";
+    EK_LOG_INFO("make a str:%s", i_am_a_string);
+    s = ek_str_create(i_am_a_string);
+    EK_LOG_INFO("s:%s", ek_str_get_cstring(s));
+    EK_LOG_INFO("before free:%zu used:%zu", ek_heap_unused(), ek_heap_used());
+    ek_str_free(s);
+    EK_LOG_INFO("after free:%zu, used:%zu", ek_heap_unused(), ek_heap_used());
+
+    const char *hello = "hello";
+    EK_LOG_INFO("make a str:%s", hello);
+    s = ek_str_create(hello);
+    EK_LOG_INFO("s:%s", ek_str_get_cstring(s));
+    EK_LOG_INFO("str append");
+    ek_str_append(s, " world!");
+    EK_LOG_INFO("s:%s", ek_str_get_cstring(s));
+
+    const char *embeddekit = "EmbeddedKit";
+    EK_LOG_INFO("before append:%s", ek_str_get_cstring(s));
+    EK_LOG_INFO("append:%s", embeddekit);
+    ek_str_append_fmt(s, "%s", embeddekit);
+    EK_LOG_INFO("after append:%s", ek_str_get_cstring(s));
+
+    EK_LOG_INFO("slice \"%s\",at [12:%u] ", ek_str_get_cstring(s), ek_str_get_len(s));
+    ek_str_t *slice = ek_str_slice(s, 12, ek_str_get_len(s));
+    EK_LOG_INFO("slice:%s", ek_str_get_cstring(slice));
+    ek_str_free(slice);
+
+    const char *n1netynine99 = " N1netyNine99";
+    EK_LOG_INFO("cat test");
+    EK_LOG_INFO("make a new string:%s", n1netynine99);
+    ek_str_t *s1 = ek_str_create(n1netynine99);
+    EK_LOG_INFO("string:%s", ek_str_get_cstring(s));
+    EK_LOG_INFO("cat start");
+    ek_str_cat(s, s1);
+    EK_LOG_INFO("cat result:%s", ek_str_get_cstring(s));
+
+    ek_str_free(s);
+    ek_str_free(s1);
+    EK_LOG_INFO("string finished,unused heap:%zu", ek_heap_unused());
+    EK_LOG_INFO("string finished,used heap:%zu", ek_heap_used());
+}
diff --git a/Test/test.h b/Test/test.h
index 43212ce..39d4c40 100644
--- a/Test/test.h
+++ b/Test/test.h
@@ -11,6 +11,7 @@
 #include "../L2_Core/utils/inc/ek_ringbuf.h"
 #include "../L2_Core/utils/inc/ek_vec.h"
 #include "../L2_Core/utils/inc/ek_assert.h"
+#include "../L2_Core/utils/inc/ek_str.h"
 
 #define PI (3.141592f)
 
@@ -23,5 +24,6 @@ typedef struct
 void stack_test(void);
 void ringbuf_test(void);
 void vec_test(void);
+void str_test(void);
 
 #endif
diff --git a/ek_conf.h b/ek_conf.h
index 9141212..2bc8a44 100644
--- a/ek_conf.h
+++ b/ek_conf.h
@@ -26,6 +26,7 @@
  * 模块功能开关
  * - EK_EXPORT_ENABLE: 使能自动初始化
  * - EK_IO_ENABLE: 使能IO库(基于lwprintf)
+ * - EK_STR_ENABLE: 使能字符串处理模块
  * - EK_LOG_ENABLE: 使能日志模块
  * - EK_LIST_ENABLE: 使能链表模块
  * - EK_VEC_ENABLE: 使能向量模块
@@ -35,6 +36,7 @@
  * ======================================================================== */
 #define EK_EXPORT_ENABLE  (0)
 #define EK_IO_ENABLE      (1)
+#define EK_STR_ENABLE     (1)
 #define EK_LOG_ENABLE     (1)
 #define EK_LIST_ENABLE    (1)
 #define EK_VEC_ENABLE     (1)