diff --git a/day8/d1/README.md b/day8/d1/README.md
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+### 静态库生成
+
+```bash
+# 汇编源文件 xxx.c ---> xxx.o
+gcc -c xxx.c -o xxx.o
+# 使用汇编后的源文件生成静态库 xxx.o ---> libxxx.a
+ar rc libxxx.a xxx.o
+```
+
+### 静态库的使用
+
+```bash
+# 生成可执行文件 a.out
+gcc -static test.c -L/home/.../libs -lxxx -I/home/.../includes
+# 生成自定义可执行文件 test
+gcc -static test.c -o test -L/home/.../libs -lxxx -I/home/.../includes
+```
diff --git a/day8/d1/my/includes/my.h b/day8/d1/my/includes/my.h
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+++ b/day8/d1/my/includes/my.h
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+#ifndef __MY_H__
+#define __MY_H__
+
+#include <stdio.h>
+
+extern int sum(int, int);
+extern int sub(int, int);
+
+#endif
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diff --git a/day8/d1/my/libs/libmy.a b/day8/d1/my/libs/libmy.a
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index 0000000..a35fcdb
Binary files /dev/null and b/day8/d1/my/libs/libmy.a differ
diff --git a/day8/d1/test.c b/day8/d1/test.c
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--- /dev/null
+++ b/day8/d1/test.c
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+#include "./my/includes/my.h"
+
+int main()
+{
+    int a = 10, b = 20;
+    printf("10+20=%d\n", sum(a, b));
+    printf("20-10=%d\n", sub(b, a));
+    return 0;
+}
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