The authenticity of laser interference effect testing is high，but the cost is high. Therefore，laser interference effect testing under different interference situations is meaningful for evaluating the anti-interference ability of infrared imaging systems and the interference ability of laser equipment. In this paper，laser interference experiment under far-field conditions is done. And then，the far field situation of laser jamming is analyzed. It is pointed out that the spot distribution on the detector surface of imaging system is plane wave diffraction. Then the near field situation of laser jamming is analyzed. The wavelength and repetition rate of interference laser are simulated by the same parameters laser. The incidence angles of interference laser are simulated by three-dimensional turntable. The attenuation of power of interference laser beam is realized with attenuator. The divergence angle of laser beam is controlled by laser beam expander optical system. The spot distributions on the detector surface of the near field situation and the far field situation are quite similar when the truncation ratios of Gaussian laser beam are greater than three times. Finally，the structure chart of measurement system of laser interference effects are given. The research is useful for the laser disturbing imagining system test. It also can be applied to design of laser jamming test system.