diff --git a/sylib/sylib.c b/sylib/sylib.c
new file mode 100644
index 00000000..9eb7c75c
--- /dev/null
+++ b/sylib/sylib.c
@@ -0,0 +1,98 @@
+// SysY 运行库实现：
+// - 按实验/评测规范提供 I/O 等函数实现
+// - 与编译器生成的目标代码链接，支撑运行时行为
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+// 输入函数
+int getint() {
+    int value;
+    scanf("%d", &value);
+    return value;
+}
+
+int getch() {
+    char ch;
+    scanf("%c", &ch);
+    return (int)ch;
+}
+
+float getfloat() {
+    float value;
+    scanf("%f", &value);
+    return value;
+}
+
+int getarray(int arr[]) {
+    int n;
+    scanf("%d", &n);
+    for (int i = 0; i < n; i++) {
+        scanf("%d", &arr[i]);
+    }
+    return n;
+}
+
+int getfarray(float arr[]) {
+    int n;
+    scanf("%d", &n);
+    for (int i = 0; i < n; i++) {
+        scanf("%f", &arr[i]);
+    }
+    return n;
+}
+
+// 输出函数
+void putint(int value) {
+    printf("%d", value);
+}
+
+void putch(int ch) {
+    printf("%c", (char)ch);
+}
+
+void putfloat(float value) {
+    printf("%a", value);
+}
+
+void putarray(int n, int arr[]) {
+    printf("%d:", n);
+    for (int i = 0; i < n; i++) {
+        printf(" %d", arr[i]);
+    }
+    printf("\n");
+}
+
+void putfarray(int n, float arr[]) {
+    printf("%d:", n);
+    for (int i = 0; i < n; i++) {
+        printf(" %a", arr[i]);
+    }
+    printf("\n");
+}
+
+// putstr 在测试用例中定义
+
+// 计时函数
+static clock_t start_time = 0;
+
+void starttime() {
+    start_time = clock();
+}
+
+void stoptime() {
+    clock_t end_time = clock();
+    double elapsed = (double)(end_time - start_time) / CLOCKS_PER_SEC;
+    fprintf(stderr, "Total time: %.6f seconds\n", elapsed);
+}
+
+// 内存管理函数（如果需要）
+void* _sysy_allocate(int size) {
+    return malloc(size);
+}
+
+void _sysy_deallocate(void* ptr) {
+    free(ptr);
+}
diff --git a/sylib/sylib.h b/sylib/sylib.h
new file mode 100644
index 00000000..502d488e
--- /dev/null
+++ b/sylib/sylib.h
@@ -0,0 +1,4 @@
+// SysY 运行库头文件：
+// - 声明运行库函数原型（供编译器生成 call 或链接阶段引用）
+// - 与 sylib.c 配套，按规范逐步补齐声明
+