介绍了同步辐射压弯镜重力引起的面型斜率误差及评价标准。根据梁的弯曲理论，提出了力矩加多点力补偿重力的方法，以上海光源XAFS光束线(BL14W)中的压弯镜为例，计算出力矩加两点力、力矩加三点和力矩加四点力补偿的最小斜率均方根误差分别为0.092，0.041，0.022 μrad。补偿结果的对比表明，当镜子两端有力矩补偿时，各补偿力相应减小，力矩加两点力、力矩加三点力和力矩加四点力补偿的面型斜率误差分别为没有力矩补偿时的52%，61%，68%。力矩加多点力补偿重力的方法明显优于多点力补偿重力的方法。

Slope error and evaluation criteria of bent mirror of synchrotron radiation induced from gravity are introduced. According to the bending theory of beam, a method of gravity compensation by couple combined with multi-point forces is proposed. Taking the bent mirror of the XAFS beam-line (BL14W) at Shanghai Synchrotron Radiation Facility (SSRF) as an example, the minimum root mean square (RMS) slope error of the bent mirror under the action of two-point, three-point and four-point forces combined with couples are calculated, and the result is 0.092, 0.041 and 0.022 μrad, respectively. The comparison between the compensation results shows that when a couple is applied to both ends of the mirror, the corresponding compensation forces decreases, and the slope errors of the couple combined with two-point, three-point and four-point forces are 52%, 61% and 68% of those without couples. Obviously, the compensation method of couples combined with multi-point forces is better than the multi-point forces compensation method.