To　describe　whether　the　start　time　of　signal　control　timing　planning　in　intersection　adapts　to　changeable　traffic　flow,　the　conception　of　control　scheme　reliability　is　defined　and　the　calculation　method　is　also　discussed.　By　using　collected　traffic　data　and　signal　timing　scheme,　this　method　is　applied　into　the　evaluation　of　traffic　control　system.　The　result　shows　that　defining　the　conception　of　control　scheme　reliability　and　using　the　method　to　confirm　the　fixed　timing　scheme　can　adapt　to　changeable　traffic　flow　better.