Based on the Mach-Zehnder interferometer, the detection principle of quantum interferometric radar based on coherent state light source is analyzed. The influence of intensity fluctuation and atmospheric loss caused by atmospheric scintillation on the performance of quantum interferometric radar is studied systematically. Then, the atmospheric channel is regarded as dissipation-fluctuation channel. Based on the classical statistical theory of turbulence, the probability distribution of transmission coefficient (PDTC) function P(T) is derived. Furthermore, P(T) is used to investigate the sensitivity and resolution of the quantum interferometric radar, especially the influence of average transmission coefficient T-A and the scintillation index β2D on the detection performance of the quantum interferometric radar. These research results exhibit that, in a high-loss environment, the fluctuation of transmission caused by atmospheric scintillation is able to improve the sensitivity and resolution of the coherent state quantum interferometric radar remarkably.