diff --git a/related_info/lab0/lab0_ex4.md b/related_info/lab0/lab0_ex4.md
index eb0fa8b..8cbdf8f 100644
--- a/related_info/lab0/lab0_ex4.md
+++ b/related_info/lab0/lab0_ex4.md
@@ -7,6 +7,4 @@ If you get gcc's error, try to read make.log and fix the bugs.
 
 If gcc successed, then you will get a.out. 
 
-Try to answer below question. 
-
 
diff --git a/related_info/lec7-8/lec7_1.c b/related_info/lab0/lab0_ex5.c
similarity index 100%
rename from related_info/lec7-8/lec7_1.c
rename to related_info/lab0/lab0_ex5.c
diff --git a/related_info/lab0/lab0_ex5.md b/related_info/lab0/lab0_ex5.md
new file mode 100644
index 0000000..23fa202
--- /dev/null
+++ b/related_info/lab0/lab0_ex5.md
@@ -0,0 +1,19 @@
+#README
+analysis lab0_ex5
+```
+echo "compile and analysis lab0_ex5"
+echo "====================================="
+gcc -m32 -g -o lab0_ex5.exe lab0_ex5.c
+echo "====================================="
+echo "using objdump to decompile lab0_ex5"
+echo "====================================="
+objdump -S lab0_ex5.exe 
+echo "====================================="
+echo "using readelf to analyze lab0_ex5"
+echo "====================================="
+readelf -a lab0_ex5.exe
+echo "====================================="
+echo "using nm to analyze lab0_ex5"
+echo "====================================="
+nm lab0_ex5.exe
+```
diff --git a/related_info/lec7-8/lec7_2-fork.c b/related_info/lab0/lab0_ex6.c
similarity index 100%
rename from related_info/lec7-8/lec7_2-fork.c
rename to related_info/lab0/lab0_ex6.c
diff --git a/related_info/lab0/lab0_ex6.md b/related_info/lab0/lab0_ex6.md
new file mode 100644
index 0000000..7ca63b7
--- /dev/null
+++ b/related_info/lab0/lab0_ex6.md
@@ -0,0 +1,9 @@
+#README
+analysis lab0_ex6
+```
+echo "====================================="
+echo "compile and analysis lab0_ex6"
+echo "====================================="
+gcc -g -m32 -o lab0_ex6.exe lab0_ex6.c
+./lab0_ex6
+```
diff --git a/related_info/lec7-8/Makefile b/related_info/lec7-8/Makefile
deleted file mode 100644
index 1206560..0000000
--- a/related_info/lec7-8/Makefile
+++ /dev/null
@@ -1,25 +0,0 @@
-all: lec7_1.c
-	@echo "====================================="
-	@echo "compile and analysis lec7_2"
-	@echo "====================================="
-	gcc -g -o lec7_2 lec7_2-fork.c
-	@echo "====================================="
-	@echo "compile and analysis lec7_1"
-	@echo "====================================="
-	gcc -g -o lec7_1 lec7_1.c
-	@echo "====================================="
-	@echo "using objdump to decompile lec7_1"
-	@echo "====================================="
-	objdump -S lec7_1
-	@echo "====================================="
-	@echo "using readelf to analyze lec7_1"
-	@echo "====================================="
-	readelf -a lec7_1
-	@echo "====================================="
-	@echo "using nm to analyze lec7_1"
-	@echo "====================================="
-	nm lec7_1
-process_state:
-	top
-clean:
-	rm ./lec7_1 ./lec7_2