Abstract: In this paper, the structural parameters of the studied gun have been chosen and the property of the gun has also been evaluated. All these are based on the combination of experiments with theoretical analysis and the comparison of the like. The gun made from these data was subject to igniting experiments and its result shows that there is a good relationship between the measured and the expected value. This proves that the design of the thermal spray gun is reasonable and the evaluation of the gun property is comparable precise. This provides a reliable theoretical accordance to improve the gun structure and its behavior.