讨论了克尔透镜锁模激光腔中热效应对锁模的影响，用数值解法给出了当存在热效应时腔中光斑半径随归一化功率的变化曲线．同时给出了存在热效应时光斑半径对脉冲归一化功率的相对敏感度参数．讨论了克尔效应与热效应在自锁模激光器中的工作机理和所起作用，给出了克尔透镜锁模下的热不灵敏条件 The effect of the thermal effect on the mode-locking in the Kerr lens-locked laser cavity is discussed. The numerical solution is given to show the variation of the spot radius with the normalized power when the thermal effect exists. The relative sensitivity of the spot radius to the normalized pulse power in the presence of thermal effect is also given. The working mechanism and role of Kerr effect and thermal effect in self-mode-locked lasers are discussed. The thermal insensitive conditions under Kerr lens clamping mode are given