目的　分析复杂螺栓联接工作载荷的分配， 并对某气缸盖螺栓进行抗疲劳设计． 方法　通过对螺栓预紧力的温度法模拟， 用有限元法计算螺栓拉力增量， 根据疲劳强度理论对螺栓进行校核． 结果　获得了螺栓的拉力增量ΔＱ 值， 经校核， 原设计满足疲劳强度条件． 结论　运用有限元法可以方便经济地计算出复杂螺栓联接的拉力增量， 以此可直接对其进行抗疲劳设计 OBJECTIVE: To analyze the distribution of complex bolting working load and to design the fatigue resistance of a cylinder head bolt. Methods By means of temperature method simulation of bolt pretension, bolt increment was calculated by finite element method, and the bolt was checked according to fatigue strength theory. The results obtained bolt increment ΔQ value of tension, after checking, the original design to meet the fatigue strength conditions. Conclusion Finite element method can be easily and economically calculate the incremental bolt tension increase, which can be directly anti-fatigue design