Abstract: With the construction of China′s new power system and the rapid development of distributed new energy, emergency power vehicles play an increasingly important role in handling power grid accidents and ensuring power supply for major events. This article is based on the PMS3.0 system and studies the parallel and grid connected control technology of emergency power supply vehicles. By constructing a technical framework, core control strategies including pre parallel synchronization and load distribution, dynamic control of grid switching, and fault isolation and recovery were designed. The experimental results show that this technology performs excellently in parallel synchronization, grid switching, and fault handling, significantly improving the power supply reliability of emergency power vehicles.