初始地应力场是影响岩体工程稳定性的重要因素之一，是岩土工程设计所需的基本指标。结合锦屏水电站坝区的工程地质条件以及实测地应力资料，采用三维有限单元法，引入灰色控制系统理论，对坝区的初始应力场进行回归分析，求出最优回归系数；实测点回归值与实测值的对比分析表明两者在量值和方向上接近，表明回归所得的应力场是合理的，从而获得坝区初始地应力场，为坝区高边坡、地下厂房的开挖模拟及长期稳定性提供了合理的三维初始应力场。

Initial geostress is one of the most important factors influencing stability of rock engineering and is basic index necessary for design of geotechnical engineering. On the basis of engineering geological conditions and measured geostress data of Jinping Hydropower Project, grey control system theory and finite element method are applied to analyze the initial geostress of dam region and the optimum regression coefficient can be derived. Through comparison between computed and measured geostress values of measuring points, it has been found that the two are similar in values and directions, which shows the accuracy and reasonability of the geostress field regression. Thereby, the distribution of initial geostress field of dam region can be obtained, and then a rational 3D initial geostress field for excavating simulation and stability analysis of high slope and underground powerhouse of Jinping Hydropower Project is provided.