As the basic structure of all-optical computing basic logic unit, the research progress of all-optical switch affects the development of all-optical computing and even the development of integrated optical field. An ultrafast all-optical switch with silicon-based silica structure is designed. The extinction ratio and the switch response time of the optically controlled optical switch are measured through two-color pump-probe experiment. The design of ultrafast all-optical switch with the switch intensity ratio of 7:1 and the switching time of 500 fs is realized.