It is of great significance to analyze the influence of radar cross section（RCS） reduction of target drone on weapon system inspection for the practical application of radar stealth target drone and its stealth efficiency. The influence of radar scattering characteristics， fluctuation characteristics and angular glint of target on radar function is briefly described， and the internal relationship between stealth， self-motion characteristics and external dimensions of target and characteristics of target fluctuation and angular glint is combed and analyzed. According to the influence mechanism of stealth characteristics of drone on the process of weapon guided attack， the related target characteristics of stealth drone and the influencing factors of its effectiveness are analyzed. Focusing on the difference in stealth purposes between drone and combat aircraft， suggestions are given for the application of stealth drone target testing.