diff --git a/src/bin/izoli.rs b/src/bin/izoli.rs
index 34d8100..00d36c6 100644
--- a/src/bin/izoli.rs
+++ b/src/bin/izoli.rs
@@ -1,6 +1,6 @@
 use izolilib::{
-    cgroup::cgroup::CGroup,
-    izolibox::{CGroupOption, IzoliBox},
+    cgroup::{cgroup::CGroup, cgroup_option::CGroupOption, cpu_limit::CpuLimit},
+    izolibox::IzoliBox,
 };
 
 fn main() {
@@ -21,7 +21,15 @@ fn main() {
         .add_subtree_control(cgroup.get_controllers().unwrap())
         .unwrap();
 
-    let izolibox = IzoliBox::new(1, Some(CGroupOption {}));
+    let izolibox = IzoliBox::new(
+        1,
+        Some(CGroupOption {
+            cpu_max: Some(CpuLimit {
+                max: izolilib::cgroup::limit_value::CGroupLimitValue::Value(1000),
+                period: 100000,
+            }),
+        }),
+    );
     let pid = izolibox
         .enter(Box::new(|| {
             println!("Isolated process: {}", std::process::id());
diff --git a/src/cgroup/cgroup.rs b/src/cgroup/cgroup.rs
index fe20748..cdb4ac4 100644
--- a/src/cgroup/cgroup.rs
+++ b/src/cgroup/cgroup.rs
@@ -7,8 +7,8 @@ use std::{
 };
 
 use super::{
-    cgroup_stat::CGroupStat, controller::Controller, cpu_limit::CpuLimit,
-    limit_value::CGroupLimitValue,
+    cgroup_option::CGroupOption, cgroup_stat::CGroupStat, controller::Controller,
+    cpu_limit::CpuLimit, limit_value::CGroupLimitValue,
 };
 
 pub struct CGroup {
@@ -41,6 +41,14 @@ impl CGroup {
         fs::create_dir_all(root)
     }
 
+    pub fn apply_options(&self, option: &CGroupOption) -> Result<(), std::io::Error> {
+        if let Some(cpu_max) = &option.cpu_max {
+            self.set_cpu_max(cpu_max)?;
+        }
+
+        Ok(())
+    }
+
     pub fn enter(&self) -> Result<(), std::io::Error> {
         let pid = std::process::id();
 
@@ -178,6 +186,14 @@ impl CGroup {
         Ok(CpuLimit::from_str(&max).unwrap())
     }
 
+    // cpu write
+
+    pub fn set_cpu_max(&self, cpu_limit: &CpuLimit) -> Result<(), std::io::Error> {
+        let to_write = cpu_limit.to_string();
+
+        self.write("cpu.max", &to_write)
+    }
+
     fn write_value<T>(&self, name: &str, value: T) -> Result<(), std::io::Error>
     where
         T: fmt::Display,
diff --git a/src/cgroup/mod.rs b/src/cgroup/mod.rs
index c15340c..981fadd 100644
--- a/src/cgroup/mod.rs
+++ b/src/cgroup/mod.rs
@@ -1,4 +1,5 @@
 pub mod cgroup;
+pub mod cgroup_option;
 pub mod cgroup_stat;
 pub mod controller;
 pub mod cpu_limit;
diff --git a/src/izolibox.rs b/src/izolibox.rs
index f624547..4524a2e 100644
--- a/src/izolibox.rs
+++ b/src/izolibox.rs
@@ -4,12 +4,10 @@ use nix::{
     unistd::Pid,
 };
 
-use crate::cgroup::cgroup::CGroup;
+use crate::cgroup::{cgroup::CGroup, cgroup_option::CGroupOption};
 
 const STACK_SIZE: usize = 8192;
 
-pub struct CGroupOption {}
-
 pub struct IzoliBox {
     pub id: usize,
     pub cgroup_option: Option<CGroupOption>,
@@ -27,8 +25,9 @@ impl IzoliBox {
             | CloneFlags::CLONE_NEWIPC
             | CloneFlags::CLONE_NEWPID;
 
-        if let Some(_cgroup_option) = &self.cgroup_option {
+        if let Some(cgroup_option) = &self.cgroup_option {
             let cgroup = CGroup::new(&format!("izoli/box_{}", self.id)).unwrap();
+            cgroup.apply_options(cgroup_option).unwrap();
             cgroup.enter().unwrap();
         }