本文研究了鞍点附近多维的位能曲面及鞍点所在位置；并用ＷｅｒｎｅｒＷｈｅｅｌｅｒ及无旋液体等两种方法计算了多维的质量系数与粘滞系数，然后用多维Ｋｒａｍｅｒｓ公式计算了裂变速率．发现裂变速率随着维数的增加而适当增大．不同的形变参量以及不同的计算质量和粘滞系数方法对计算核裂变速率影响不大．从结果看，采用三维计算裂变几率已足够准确． In this paper, we study the multi-dimensional potential energy surface and the location of the saddle point near the saddle point. We also calculate the multi-dimensional mass coefficient and viscosity coefficient by two methods, WernerWheeler and the non-rotating liquid, then calculate the fission rate by the multi-dimensional Kramers formula. It is found that the fission rate increases with the increase of dimension. Different deformation parameters and different calculation methods of mass and viscosity have little effect on calculating the rate of nuclear fission. From the results, the probability of fission using 3D is accurate enough.