Abstract: In the process of heat mining of heavy oil, sands seriously come out from oil-well as a result of interaetion of clasts of the reserviors with the injected alkaline steam, which remains a technical problem in the world. 10 core samples from the most severe sand well of Biqian G51310 of Henan oil field were experimented on elastic dissolution under site heat mining conditions. Their geological significance was discussed, which may provide some useful information for heat mining of heavy oil.