The influences on the isolation of the optical isolators in pulsed laser situation are theoretically analyzed, including magneto-optical crystal's photoelastic effect caused by temperature gradient on cross section, extinction ratio and Kerr effect, and compared with those in continuous laser situation. The result shows that, in the situation of the same average power, pulsed laser has a lower isolation than continuous laser. When the average power is low, extinction ratio has a larger effect on isolation; when the average power is high, the effect of extinction ratio is limited, and the photoelastic effect is the main effect on isolation. When the peak power density is high, Kerr effect reduces the isolation a lot. And Kerr effect could reduce the isolation more with increasing the peak power density.%从理论上分析了脉冲情况下,磁光晶体横向温度梯度引起的光弹效应、消光比以及克尔效应对光隔离器隔离度的影响,并与连续入射情况进行了对比.结果表明:在平均功率相同的情况下,脉冲光束入射比连续光束入射情况隔离度更低；当平均功率较小时,消光比对隔离度的影响较大；当平均功率较大时,消光比对隔离度的影响有限,主要表现出光弹效应对隔离度的影响；当峰值功率密度较大时,克尔效应将显著降低隔离度,并且峰值功率密度越大,对隔离度的降低程度越大.
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