Abstract: Through the research on the wireless network construction in several top universities, their demand for the construction of intercollegiate mobile roaming is analyzed. Considering the safety access of intercollegiate mobile roaming, authentication of intercollegiate mobile roaming and construction of intercollegiate mobile roaming center of these three aspects, the certificate of Chinese mandatory safety standards, WAPI, is proposed. The certificate extends roaming authentication encryption and superimposes the method of LDAP/RADIUS roaming authentication. It also combines with the practical situation of roaming of schools and its belonging. It is respectively certificated by the affiliated school and roaming center. The solution can achieve high safety performance，high operation performance and simple construction of intercollegiate mobile network roaming. Through the education information resources sharing, a wider inter school academic communication environment is created.