Abstract: Cold model of moving bed of Corex melter gasifier was set up. Flow pattern of solid,geometry and size of deadman were obtained by the trace of tracer particles in the moving bed. Furthermore,the effect of height of moving bed and gas flow on the height and cross- sectional area of deadman were studied. The results show that the moving bed can be divided into four subdomains according to velocity magnitude of solid particles. The stagnation zone with semi- elliptic geometry is formed at the central bottom of the moving bed. When other parameters are kept constant,the height and cross- section area of the stagnation zone decrease with the increase of moving bed height or total gas flow rate.