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In order to reduce collisions, based on the analysis of vehicle braking process, a new vertical safety distance algorithm is put forward in this paper, the safety distance distinguished warning distance and dangerous distance. The hardware system of anti-collision alarm system based on laser rangefinder with the LPC2214 as the core was designed, TDC-GP2 for timing laser flight. The software flow of system and amplifiers of laser transmitter and the receiver are introduced. Through Matlab test when car at 100km/h and preceding vehicle at 0km/h and 80km/h, the algorithm is precise and reliable, it has strong practical application value. The distance between the two cars can be range finding best by system through experiments.