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In order to strength the information exchange between intersection unit and transit vehicle, and improve the efficiency of transit signal priority system, regarding the RFID electronic tags as information exchange intermediary, vehicle road communication environment is established, and transit signal priority system including traffic signal system and transit system as a whole is constructed. Through information exchange with electronic tags, intersection unit makes signal prior requesting of transit vehicle classification staggered, and calculates control parameters including signal timing, suggested speed, station time and so on, priority scheme based on guide is formulated, and transit vehicle priority and safety service can be achieved in intersection. Experimental results show that in high saturation state, guidance strategy in the article can make the average delay of bus in intersection reduce by 30%, and there is a better efficiency in the medium and low saturation state .