In　order　to　detect　the　snow　coverage　status　such　as　mild　or　heavy　coverage　on　road　to　keep　car　running　safe,　snow　coverage　detection　method　together　with　naive　Bayesian　classification　algorithm　was　proposed.　Firstly,　road　visual　feature　was　extracted　from　the　video　by　the　method　of　machine　vision　and　video　object　segmentation.　Then　the　road　snow　coverage　status　was　classified　with　naive　Bayesian　classifier.　The　performance　of　KNN,　ANN　and　SVM　classifier　for　road　snow　coverage　problem　were　compared.