Abstract: According to the characteristics of No-Hit-Zone (NHZ) hopping code, a multi-access quasi-synchronous scheme based on NHZ hopping code for frequency hopping communication system was proposed. Simulation results prove that the scheme assured the frequency hopping system to work within NHZ hopping code. It decreases the multi-access interference and improves the integral bit error rate performance of the system, and is suitable for multi-user frequency hopping system.