The collision warning of connected vehicles is an important application of intelligent and connected vehicles. However, positioning accuracy, time delay and packet loss of connected vehicles technology will affect the performance of collision warning, and even influence driving safety .In order to analyze the impact of positioning accuracy, time delay and packet loss on the driving safety of connected vehicles, this study designed an experimental test case for field test .The safety performance evaluation system of connected vehicles is constructed by using safety evaluation indexes, and the changes of safety performance of connected vehicles under different positioning accuracy, delay and packet loss are analyzed. It also explores the positioning accuracy, delay and packet loss boundaries corresponding to the safety performance requirements of connected vehicles in different application scenarios, and improves the test and evaluation system of connected vehicles, providing technical support for the application of collision warning of connected vehicles. Keywords: Collision warning of connected vehicles,；V2X；Influence factor；Field test； Safety evaluation

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