China　has　been　using　the　American　formula　and　LOS　to　analyze　the　weaving　sections　of　urban　expressway　all　the　time,　but　except　that　the　urban　expressway　standard　is　different　from　American　freeway,　the　operation　characteristics,　drivers＇　characteristics　and　so　on　are　also　different　from　those　of　foreign　countries,　so　the　analyzed　result　whether　or　not　accords　with　actual　conditions　is　still　a　question.　The　most　effective,　scientific　method　is　to　use　the　field　data　of　China　to　calibrate　the　existing　formula,　so　the　field　data　gathered　from　the　weaving　sections　of　the　expressway　in　Beijing,　Shanghai　and　Guangzhou　to　calibrate　the　operation　speed　formula　of　weaving　sections　of　HCM2000,　U.S.A.　Through　validation　and　using　calibrated　formula　to　do　example　analysis,　it　proves　that　the　result　from　calibrated　formula　can　reflect　actual　operation　conditions　of　the　weaving　sections　objectively,　thus　it　has　good　value　for　application.　In　addition,　through　surveying　and　studying　the　situation　and　conditions　of　weaving　sections　in　existing　expressway　system　in　China,　weaving　sections　are　divided　into　3　types　of　configuration,　that　is　type　I,　II　and　III.