Abstract: Based on the relevant knowledge of photometry, the intensity distribution of a black light lamp on work platform was computed and measured, then simulated by using Matlab. A physical model of the black light lamp was established and the formula of radiated intensity was deduced at each point of the work platform via some reasonable assumptions. The simulation and experimental result clearly showed that one hour after the black light lamp had been switched on, the distribution of light intensity was gradually stabilized and a 30cm×20cm steady rectangle light field varying within 12.5% could be obtained. Furthermore, the result manifested that using the LED light source array instead of the black light lamp could obviously improve the uniformity and stability of the intensity distribution of the light field.