There are abundant halite resources with reserves about 100 billion tons in the strata of Paleogene System at Shahejie Formation in Ningjin area of Jizhong plain. However,the mined-out areas formed by solution mining of halite deposits may easily lead to geological disasters and environmental problems such as excessive surface subsidence,collapse,land salinization and so forth. So,how to effectively predict and control roof fall of salt cavities has become the most pressing problem. Based on the rectangular plate theory and the non-porous elastic circular plate theory,the stability of the overlying strata in Ningjin Halite Mine is analyzed. The results show that the critical horizontal stresses of the overlying strata of cavity are and under the two theories,respectively. The stability and reliability of the overlying strata in Ningjin Halite Mine under the above two models are also analyzed.