The obscuring performance of smoke cloud was influenced by different turbulent diffusion characters. The initial flow ability of exploding smoke cloud was studied in this paper. Based on the differential equations of the Plandtl boundary layer and performance of smoke cloud on the ground,flow model of the boundary layer and formation model of smoke cloud by blasting were established. According to experiments and the model hypothesis under different conditions,the initial flow ability of smoke cloud forming was analyzed. The results show that the flow of the smoke cloud is mainly turbulent,and its expanding velocity is attenuated rapidly by air drag.