Based on the silicon on insulator platform, a silicon-based cross hybrid used for optical interference computation is designed and produced. Utilizing the structure parameter of the multimode interference coupling and the entire device of the finite-difference time-domain method, the simulation results indicated the ports of the output have a good transmission rate. After preparing the chip using the lithography process and packaging, the performance of the hybrid was characterized by an external voltage. The test results showed that at the working wavelength of1551.8 nm, after the voltage was applied, the output light power and voltage were in a sinusoidal style, verifying the phenomenon of constructive interference and destructive interference. The voltage that caused the π phase change of the two output ports was 2 V, and the voltage regulation π phase deviation accuracy was 0.991π and 1.007π respectively. The calculated phase deviation was 0.79°. The device size is 435 μm×80 μm. This device has a simple structure, low cost, and stable performance, which has broad application prospects in the field of interference imaging.