Abstract: In order to improve the issuing security of pseudonym certificate to On-board Units(OBU), and reduce the issuing delay of pseudonym certificate, a pseudonym certificate issuance policy(APCI) based on agent is explored in this paper. The main work focuses on the initialization of Certification Center(CA) system, authorization of RSU agent. Using RSU agent to achieve cross-regional application and certificate revocation of vehicle pseudonym, and achieving security authorization of RSU agent and security issuing of pseusonym certificate of OBU based on the short group signature and bilinear pairing technologies. According to the simulation results and analysis, the proposed policy achieves secutity issuing of pseudonym certificate to vehiches and reducing the issuing delay of pseudonym certificate.