Sensitive devices mounted on the rocket warhead can be designed and chosen based on the studies of partial cavitation flow field around it. This paper studied the method of simulation analysis on the cavitation flow field of an underwater rocket war head by using the RANS( steady) and LES( unsteady) turbulence model. The simulation result was compared and validated with experimental results. The steady / unsteady cavitation flow fields around the warhead were analyzed in zero attack angle / small attack ang...