Phase sensitive amplification(PSA),as an important part of all optical signal processing,can improve the transmission property of optical communication link.In this paper,the horizontal double slot silicon waveguides model is constructed by combining the C rich SiC with an atom ratio of 1.28 C to Si.The dispersion flat part of the model approximately covers the wavebands of 500 nm with multiple zero dispersion points,and the nonlinear coefficient can reach up to 20000 W -1·m -1.The finite element method is used to analyze and calculate the mode field distribution,dispersion characteristics and nonlinear characteristics in the communication band.Meanwhile,combined with the optimized structure size waveguide model,the optical transmission model based on four wave mixing(FWM)effect in silicon waveguide is established,and the phase sensitive characteristics of the waveguides under QPSK signal are solved and analyzed.The simulation results show that the waveguide can achieve 34 dB phase sensitive gain and has potential applications in the field of on chip signal processing.