diff --git a/resource/runner/problem/example/README.md b/resource/runner/problem/example/README.md
index 39ffa40..d68454a 100644
--- a/resource/runner/problem/example/README.md
+++ b/resource/runner/problem/example/README.md
@@ -5,7 +5,7 @@
 ```
 .
 ├── config.json            # 题目配置信息
-├── description.md         # (not used) 题目描述必须通过 API 提交给系统
+├── description.md         # (optional) 题目描述，必须通过 API 提交，使用 import 脚本时将读取该文件
 ├── data                   # 数据目录
 │   ├── input              # 输入数据
 │   │   ├── (x).input      # 第 x 组输入数据
@@ -25,20 +25,21 @@
 
 ```json5
 {
-    "Runtime": {
-        // 运行时配置
+  "Runtime": {
+    // 运行时配置
         "TimeLimit": 1000, // 时间限制 (ms)
         "MemoryLimit": 16, // 内存限制 (MB)
         "NProcLimit": 1    // 进(线)程 限制
     },
-    "Languages": [
+  "Languages": [
+    // 支持的语言
         // c 语言，使用自定义评测脚本，脚本为 ./judge/XYZ.Makefile
         {"Lang": "c", "Type": "custom", "Script": "XYZ.Makefile", "Cmp": ""},
         // c++ 语言，使用默认评测脚本，答案比对方式为 NCMP(testlib)
         {"Lang": "cpp", "Type": "default", "Script": "", "Cmp": "NCMP"}
-    ], // 支持的语言
-    "Tasks": [
-        // 评测点信息
+  ],
+  "Tasks": [
+    // 评测点信息
         {"Id": 1, "Points": 10}, // 第一个评测点，分值 25 分，使用 ./data/{input,output}/1.{input,output} 为测试数据
         {"Id": 2, "Points": 20},
         {"Id": 3, "Points": 30},
@@ -51,7 +52,7 @@
 
 1. 默认评测脚本目前只支持 `c` 语言和 `cpp`，参见 `../../framework/template/default/{c,cpp}.Makefile`
 2. 自定义评测脚本参见 `./judge/XYZ.Makefile`
-3. `prebuild.Makefile`: 题目初始化脚本，用于编译辅助程序、生成数据等。如果存在改文件，系统会在题目分发到判机后自动执行，否则跳过改步骤
+3. `prebuild.Makefile`: 题目初始化脚本，用于编译辅助程序、生成数据等。如果存在该文件，系统会在题目分发到判机后自动执行，否则跳过该步骤
 
 ## 注意事项
 
diff --git a/resource/runner/problem/example/judge/XYZ.Makefile b/resource/runner/problem/example/judge/XYZ.Makefile
index 1264083..6fcde11 100644
--- a/resource/runner/problem/example/judge/XYZ.Makefile
+++ b/resource/runner/problem/example/judge/XYZ.Makefile
@@ -2,16 +2,37 @@
 include ${TEMPLATE}/c.mk ${TEMPLATE}/Judger.mk
 
 # 评测分四个阶段
-# 1. prebuild: 用于提前生成测试数据、评测器、spj等工具，runner 只执行一次
-#              只有 ./data, ./judge 目录可见
-# 2. compile:  用于编译用户提交的程序
-#              只有 ./user/$(USER_PROG).$(LANG) 和 ./judge 目录可见
-# 3. run:      运行用户程序
-#              只有 ./data/input/*.input 和 ./user/$(USER_PROG).out 可见
-#              用户输出存放于 ./user/?.out.usr
-#              使用 woj-sandbox 运行，等效于 $(PREFIX)/user/$(USER_PROG).out < $(PREFIX)/data/input/$(TEST_NUM).input > $(PREFIX)/user/$(TEST_NUM).out.usr
-# 4. judge:    用于判定输出结果 环境变量 TEST_NUM 表示当前测试点编号
-#              所有目录 ./data ./judge ./user 可见
+# 1. prebuild:	用于提前生成测试数据、评测器、spj等工具，runner 只执行一次
+# 				详细信息见 XYZ.Makefile
+# 2. compile:	用于编译用户提交的程序
+# 				目录映射情况：
+# 						/woj/problem
+# 						     ├── judge	映射到题目目录的 ./judge	<-- Readonly
+# 						     └── user	映射到题目目录的 ./user	<-- 用户提交的程序在这里，命名：$(USER_PROG).$(LANG)
+# 				环境变量：
+# 						USER_PROG=...	<-- 一段随机字符串
+# 						LANG=...		<-- 用户提交的程序的语言，如 c, cpp
+# 						其余通用环境变量，详见 ubuntu-full.Dockerfile
+# 				执行限制：
+# 						目前版本硬编码限制：时间 60s，内存 256mb
+# 3. run: 		运行用户程序
+# 				只有 ./data/input/*.input 和 ./user/$(USER_PROG).out 可见
+# 				用户输出存放于 ./user/?.out.usr
+# 				使用 woj-sandbox 运行，等效于 $(PREFIX)/user/$(USER_PROG).out < $(PREFIX)/data/input/$(TEST_NUM).input > $(PREFIX)/user/$(TEST_NUM).out.usr
+# 4. judge: 	用于判定输出结果 环境变量 TEST_NUM 表示当前测试点编号，每个测试点都会执行一次
+# 				目录映射情况：
+# 						/woj/problem
+# 						     ├── data	映射到题目目录的 ./data	<-- Readonly
+# 						     ├── judge	映射到题目目录的 ./judge	<-- Readonly
+# 						     └── user
+# 						         ├── $(TEST_NUM).out.usr	<-- 用户程序在 $(TEST_NUM) 上的输出
+# 						         └── $(TEST_NUM).judge		<-- 评测结果写在这里，格式要求为 testlib 的 XML 格式
+# 				环境变量：
+# 						TEST_NUM=...	<-- 当前测试点编号
+# 						CMP=...			<-- 在 config.json 中配置的比较器，如 NCMP
+# 						其余通用环境变量，详见 ubuntu-full.Dockerfile
+# 				执行限制：
+# 						目前版本硬编码限制：时间 60s，内存 256mb
 
 compile:
 	$(CC) $(CFLAGS) -o $(PREFIX)/user/$(USER_PROG).out $(PREFIX)/user/$(USER_PROG).$(LANG) $(PREFIX)/judge/gadget.c
diff --git a/resource/runner/problem/example/judge/prebuild.Makefile b/resource/runner/problem/example/judge/prebuild.Makefile
index c07df39..b10e235 100644
--- a/resource/runner/problem/example/judge/prebuild.Makefile
+++ b/resource/runner/problem/example/judge/prebuild.Makefile
@@ -2,6 +2,17 @@ include ${TEMPLATE}/c.mk ${TEMPLATE}/Judger.mk
 
 # 当题目被下载到 runner 后，会自动执行 prebuild 阶段，判题时不会再次执行
 
+# prebuild 阶段环境信息
+# 目录映射情况：
+# 		/woj/problem
+# 		     ├── data	映射到题目目录的 ./data
+# 		     └── judge	映射到题目目录的 ./judge
+# 环境变量：
+# 		PREFIX=/woj/problem
+# 		其余通用环境变量，详见 ubuntu-full.Dockerfile
+# 执行限制：
+# 		目前版本硬编码限制：时间 300s，内存 1g
+
 prebuild:
 	# 生成测试数据生成工具
 	clang++ -I$(TESTLIB) -Ofast -o $(PREFIX)/judge/gen.out $(PREFIX)/judge/gen.cpp
diff --git a/resource/runner/scripts/run_timeout.sh b/resource/runner/scripts/docker_run.sh
similarity index 59%
rename from resource/runner/scripts/run_timeout.sh
rename to resource/runner/scripts/docker_run.sh
index 20b64f2..560e573 100755
--- a/resource/runner/scripts/run_timeout.sh
+++ b/resource/runner/scripts/docker_run.sh
@@ -1,9 +1,12 @@
 #!/usr/bin/env bash
 
-. common.sh
+SCRIPT_PATH=$(cd "$(dirname "$0")" && pwd)
+. "$SCRIPT_PATH/common.sh"
 
 function docker_run() {
     local timeout=${TIMEOUT:-10}
+    local network=${NETWORK:-"none"}
+    local memory=${MEMORY:-"256m"}
     local log_file=${LOG_FILE:-"/dev/stderr"}
     local log_limit=${LOG_LIMIT:-4K}
     log_info "$DOCKER run with timeout $timeout"
@@ -12,7 +15,7 @@ function docker_run() {
         sleep "$timeout"
         $DOCKER kill "$CONTAINER_NAME"
     ) &
-    $DOCKER run --rm --name "$CONTAINER_NAME" "$@" 2>&1 | head -c "$log_limit" >"$log_file"
+    $DOCKER run --rm --name "$CONTAINER_NAME" --network "$network" --memory "$memory" "$@" 2>&1 | head -c "$log_limit" >"$log_file"
     pkill -P $$
     $DOCKER kill "$CONTAINER_NAME" >/dev/null 2>&1
     return 0
diff --git a/resource/runner/scripts/prepare_images.sh b/resource/runner/scripts/prepare_images.sh
index f03c696..2db7ae4 100755
--- a/resource/runner/scripts/prepare_images.sh
+++ b/resource/runner/scripts/prepare_images.sh
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
-. common.sh
+SCRIPT_PATH=$(cd "$(dirname "$0")" && pwd)
+. "$SCRIPT_PATH/common.sh"
 
 cd "$(dirname "$0")"/../ || exit 1
 
diff --git a/resource/runner/scripts/problem.sh b/resource/runner/scripts/problem.sh
index a9f2754..835499c 100755
--- a/resource/runner/scripts/problem.sh
+++ b/resource/runner/scripts/problem.sh
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
-. common.sh
+SCRIPT_PATH=$(cd "$(dirname "$0")" && pwd)
+. "$SCRIPT_PATH/common.sh"
 
 # get_problem_info
 # extract language info and limits
diff --git a/resource/runner/scripts/problem_compile.sh b/resource/runner/scripts/problem_compile.sh
index a25ccfc..ab06937 100755
--- a/resource/runner/scripts/problem_compile.sh
+++ b/resource/runner/scripts/problem_compile.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 WORKSPACE=$(cd "$(dirname "$0")"/.. && pwd)
-. "$WORKSPACE"/scripts/run_timeout.sh
 . "$WORKSPACE"/scripts/common.sh
+. "$WORKSPACE"/scripts/docker_run.sh
 . "$WORKSPACE"/scripts/problem.sh
 
 if [ "$1" == "" ] || [ ! -d "$WORKSPACE/problem/$1" ] || [ "$2" == "" ] || [ ! -d "$WORKSPACE/user/$2" ] || [ -z "$3" ]; then
diff --git a/resource/runner/scripts/problem_judge.sh b/resource/runner/scripts/problem_judge.sh
index b262d6f..c94f4bb 100755
--- a/resource/runner/scripts/problem_judge.sh
+++ b/resource/runner/scripts/problem_judge.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 WORKSPACE=$(cd "$(dirname "$0")"/.. && pwd)
-. "$WORKSPACE"/scripts/run_timeout.sh
 . "$WORKSPACE"/scripts/common.sh
+. "$WORKSPACE"/scripts/docker_run.sh
 . "$WORKSPACE"/scripts/problem.sh
 
 if [ "$1" == "" ] || [ ! -d "$WORKSPACE/problem/$1" ] || [ "$2" == "" ] || [ ! -d "$WORKSPACE/user/$2" ] || [ -z "$3" ]; then
diff --git a/resource/runner/scripts/problem_prebuild.sh b/resource/runner/scripts/problem_prebuild.sh
index e054688..b79672e 100755
--- a/resource/runner/scripts/problem_prebuild.sh
+++ b/resource/runner/scripts/problem_prebuild.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 WORKSPACE=$(cd "$(dirname "$0")"/.. && pwd)
-. "$WORKSPACE"/scripts/run_timeout.sh
 . "$WORKSPACE"/scripts/common.sh
+. "$WORKSPACE"/scripts/docker_run.sh
 
 if [ "$1" == "" ] || [ ! -d "$WORKSPACE/problem/$1" ]; then
     log_warn "Usage: $0 <problem> <timeout>"
@@ -22,6 +22,7 @@ if [ ! -f "$WORKSPACE/problem/$1/judge/prebuild.Makefile" ]; then
 fi
 
 export TIMEOUT=${2:-300}
+export MEMORY="1g"
 docker_run \
     -v "$WORKSPACE/problem/$1/data":/woj/problem/data \
     -v "$WORKSPACE/problem/$1/judge":/woj/problem/judge \
diff --git a/resource/runner/scripts/problem_run.sh b/resource/runner/scripts/problem_run.sh
index 03da64d..b23ba71 100755
--- a/resource/runner/scripts/problem_run.sh
+++ b/resource/runner/scripts/problem_run.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 WORKSPACE=$(cd "$(dirname "$0")"/.. && pwd)
-. "$WORKSPACE"/scripts/run_timeout.sh
 . "$WORKSPACE"/scripts/common.sh
+. "$WORKSPACE"/scripts/docker_run.sh
 . "$WORKSPACE"/scripts/problem.sh
 
 if [ "$1" == "" ] || [ ! -d "$WORKSPACE/problem/$1" ] || [ "$2" == "" ] || [ ! -d "$WORKSPACE/user/$2" ] || [ -z "$3" ]; then