The analysis of dynamic textures is an extremely important problem in the field of computer image processing and computer vision. Firstly, the paper briefly reviewed the dynamic textures and the analysis method. The fire in the large place is complex and difficult to be detected. In this paper, the fire detecting method adapting dynamic textures in large place is adopted to monitor the fire in the large place on real-time. The model of doing dynamic textures of the fire image using optical flow is built and simulated. In this paper, four types fire images were analyzed with dynamic textures. And the criterion of detecting fire with dynamic textures was established