Abstract: In order to gain the particle velocity of high temperature jet flow,a set of micrography system was built.The system includes double pulse YAG laser,particle magnifying and imaging system,image incepting system.After using the technique of micrography,compensating filter,sequence imaging,which helped with overcome the difficulties of small size of particle and flow field with violent irradiance and high temperature,the sequence photos of the same particle have been gotten.According to the photos,the particle velocity has also been obtained.In this paper,the principle,structures of the system and the experiment results were presented.