For the problem that the road own alignment is unconsidered in the existing turn judgment, the invention provides a method for influencing vehicle sharp bend by removing road alignment based on trajectory data and map data. The method comprises the following steps: processing data, matching the trajectory data and the map data, judging the sharp bend type, determining bend corner value, and removing road alignment influence. The precise monitoring on the driving behavior of the driver is realized, the traffic accident and the traffic congestion are reduced, and the traffic security is guaranteed.