Polyurea has good mechanical properties. Spraying structure can improve the anti detonation performance of the structure. The finite element code ANSYS/LS DYNA was used to numerically simulate the process of dynamic response of three four kinds of the composite target plate under explosive loading of 1.2kg TNT. In view of the usual spraying methods, the anti detonation performance of four target plates, that are polyurea spraying on honeycomb in positive spraying, back spraying, duplex surface spraying and in honeycomb cavity, was studied. The deformation characteristics of different types of target plates are analyzed, and the energy absorption characteristics of each part of the target plate are compared and analyzed. The results show that the honeycomb is the main energy absorption part in the target plate. In terms of deformation or energy absorption, the target plate of polyurea spraying in honeycomb is superior to three other kinds.