Taking the coherent laser based on Mach-Zehnder light path as the model,random phase screen is generated by the power spectrum method of inversion to simulate the atmospheric turbulence.The transmission of coherent Gauss beams in atmosphere turbulent was analyzed,and the transmission model was established,and the interference light intensity on the receiving screen is derived.The influences of atmosphere turbulence on the distribution of interference pattern and the characteristic parameters such as fringe spacing and contrast are analyzed by numerical simulation.The results show that with the increase of turbulence intensity,the interference pattern becomes blurred or even broken,the fringe spacing increases and the contrast ratio decreases.The results of this study have a certain reference value for the application of laser active interference detection technology.