Near infrared laser illumination is in low illumination situation, using near infrared lasers as the light source for long-distance target active lighting. Because of the laser generation mechanism, the optical system tolerance, atmospheric turbulence and other factors, the laser intensity spatial distribution on the target plane is not uniform, which has great impact on image resolution and tracking accuracy. In this paper, the area surrounded by normalized PSD (power spectral density) is adopted to evaluate the near infrared laser illumination intensity uniformity. Using this method, different near infrared laser illuminator′s uniformity evaluation parameters are studied, in the same work condition. The results verify the reasonableness of the laser power spectrum as an evaluation parameter.