Using　appropriate　models　to　evaluate　the　data　quality　can　immediately　find　abnormal　equipments　and　reduce　the　cost　of　labor　maintenance.　So　we　can　fix　them　instantly　in　order　to　avoid　negative　effects　caused　by　abnormal　data　and　maintain　the　function　of　the　intelligent　traffic　system.　In　this　paper,　we　introduce　a　evaluation　method　of　traffic　data　based　on　markov　model　and　validate　it　using　the　real　traffic　flow　data　of　Fuzhou.　The　result　of　the　experiment　proves　the　validity　of　the　method.