Secondary electronic emission on metal is the cause of multipactor effect, which is a limition of the space payload RF power increase. In this paper, micrometer-scale trap structure was constructed through large scale pol-ystyrene array to suppress secondary electron emission. PS microspheres self-assembly method are studied, the trap structure are presented, and the secondary emission characteristics are tested. The results showed that the trap structure silver film were prepared based on self-assemble of PS microspheres.Its structure can decreasing the maximum of SEY from 2.2 to 1.6