The　effects　on　CH4　and　N-2　separation　performance　of　coconut　shell　charcoal　by　high　temperature　roasting　were　studied.　Results　indicate　that　the　surface　area　increased　firstly　and　then　decreased　with　the　increasing　of　the　roasting　temperature,　and　it　is　found　that　surface　area　of　roasting　4　hours　is　higher.　Furthermore,　the　experiment　focused　on　the　effect　of　high　temperature　roasting　on　activated　carbon　adsorption　volume　and　separation　coefficient.　It　is　obvious　that　the　adsorption　volume　increases　earlier　and　then　decreases　with　the　increasing　roasting　temperature,　and　there　are　obvious　turning　points　to　adsorption　volume　of　CH4　and　N-2.　Comparing　various　roasting　time,　it　is　found　that　adsorption　volume　in　4h　is　greater　than　that　in　1h　and　also　in　6h　in　the　whole　process.　Separation　coefficient　decreases　with　increasing　roasting　temperature.　When　the　temperature　is　higher　than　800　degrees　C,　separation　coefficient　decreased　rapidly.　Considering　the　adsorption　volume　and　separation　coefficient,　roasting　4　hours　at　600　degrees　C　is　selected　for　industrialized　production.