In the analysis of relationship among fire distribution, area division and path planning, the idea of trinity tactical decision of surface ships formation missile path planning (SFMPP) is put forward, and an expandable open simulation architecture is designed based on high level architecture HLA. According to HLA/RTI specification, the federation's FOM/SOM was designed and developed. The event schedule was adopted as the simulation strategy because the system has the characteristic of discrete event simulation, the dynamic model of system was established based on Petri net, and time management and the federates' implementation process were introduced. The simulation demo indicates that the realization of this simulation platform provides anew solution for tactical decision problem of SFMPP.