Abstract: Once the oilfield development by steam?drive process enters into high water?cut stage, the big channels formed by this process will cause fluid channeling, injected steam wasting, unsatisfied production well response, thus seriously influencing the effect of oil displacement. Using one ? dimensional sand filling pipe experiment, the big channel formation and the sand production are described, through the change of permeability before and after the implementation of sand plug to judge the feasibility of sand plug of such big channels, the results show that the permeability can be restored to its original value after it. Through conversion of similarity criterion principle, using 3D model to simulate the real reservoir, the instantaneous gas?oil ratio and the cumulative recovery degree of sand plugging during the process of steam drive are analyzed, and suggested that sand plugging should be performed until the water cut reaching 90% for getting good plugging effect. Also, using suitable guar gum suspension liquid with sand to block the big channels formed by steam?drive process, the effect will be more significant