The “SG” is a large inertial confinement fusion (ICF) project that is building in china. Its essential working principium is stimulating the nuclear material in the target ball by shooting with laser, then the ICF will produce large numbers of fusion energy which is controllable. The laser is lead and transmited primary by mirror which is clamped by mirror frame in the shooting range system.For the needs of precision when shooting, there are some strict demands to the dynamic characteristics of the mirror frame. This paper designed a machine model of a array mirror frame which is quad intergrated, and simulation analysis on dynamic characteristics of the mirror frame .