Abstract: In the process of an oilfield production, sand production issue tends to extensive existence and be an inevitable. So it is important to predict the sand plug status of bottom hole, draw up rational sand washing measures, avoid sand plugging of oil layers due to too frequent operation and/or operation measures nor in time. Based on the horizontal interval sand plugging mechanism by horizontal well development of heavy oil reservoir with steam stimulation, this paper analyzed the regularity of continuous sand production, and proposed the productivity formula considering the sand plug factor. The case study indicates the rationality of the formula, which provides preliminary theoretical basis for prognosis of the sand plug situation in a sand producing well and implementing in?time sand washing. It is believed that this study will be helpful to prolong the production period length of each round of steam stimulation for heavy oil recovery by horizontal well process and increase the production of a heavy oil reservoir.