A simple evaluation method of laser beam quality used out of laboratory is proposed. Through detecting profiles of laser spots, laser beam quality is measured. According to the principles, a suite of parameters are defined to express beam quality, what is more, the measured schemes and algorithms are shown. The relationship between output energy and misalignment is researched in both mirror slanting and change of Q-states based on electro-optic Q-switch pulse laser pumped by lamp. Experimental results show that new parameters increase with the increase of misalignment and average value of parameter difference on adjacent two sections can be used to evaluate beam quality in large amount of disorder. These results indicate that valuating specifications presented can be used to evaluate beam quality and only light-sensitive photographic paper, digital camera and calculation procedure are used in the process. For simple measuring method and low experiment condition requirement, it can be used in preliminary detection of laser working position out of laboratory.