It is experimentally investigated how the effect of thin film polarizer (TFP) reflecting p-polarized light in the solid state laser resonator, which outputs p-polarized light, decreases the output power. The effect of overcoming the decreasing by outputting s-polarized light laser resonator with an intracavity thin film polarizer is also studied. The results show that, in a p-polarized solid state laser with an intracavity thin film polarizer, the power loss caused by thin film polarizer reflecting p-polarized light decreases with increasing output mirror transmission. When the laser diode drive current is 20 A and the output mirror transmission is 5%, the power loss caused by the effect of thin film polarizer reflecting p-polarized light can reach 7.13 W, which is 1.9 times of the output power of the resonator. When the output mirror transmission increases to 30%, the power loss decreases to 0.59 W, which is 8% of output power. The output s-polarized light laser resonator configure with an intracavity thin film polarizer can avoid the power loss caused by the thin film polarizer reflecting p-polarized light, and improve output power. The improving effect of this resonator configure is more outstanding, when output mirror transmission is small. When the drive current is 20 A and output mirror transmission is 5%, the output power of output s-polarized light resonator is 7.77 W, which is 2.05 times of that of output p-polarized light resonator. When the output mirror transmission increases to 30%, the output power of output s-polarized light is only 1.09 times of that of output p-polarizer light resonator.