Abstract: Using the desert wind tunnel Laboratory of Institute of Desert Research in CAREERI of CAS, and applying laser particle imaging technology, the sand particle concentration in the different section from solid-gas nozzle on solid-gas two phase flow was measured and researched and contrasted with the photograph in the equipment. The experimental results indicate that the sand particles can not diffuse the whole section that is about one meter horizontally from the sand orifice and there are all most particles in the tunnel axes, at the same time those greater particles occur below the axes, but they can just diffuse equably the whole space in the section about three meters horizontally form the orifice. The conclusion was reached that the size of supplying was about three meters to accord with our nation military standard and it provided the gist to develop ourselves sand and dust experimental equipment, to confirm the way and the parameter of supplying sand and dust and to design the size of the supplying and the test segment.