On the laser driver “Shenguang Ⅱ”, eight fundamental beams have realized power balance. By changing detuning values of parameters of the frequency tripling systems, the output pulse shapes of the output beams are mutually compared. The experiment results indicate that for the type Ⅱ-type Ⅱ polarization-mismatch frequency tripling system, when the input intensity is about 1GW/cm2, of the three parameters that influence the freguency tripling efficiency, polarization detuning angle Δθp has the most important effect on the pulse shape. When all three parameters of tripling system are at the optimized values, the full width at half maximum of pulse shape τ reaches minimum. This work describes the method of crystal adjustment to actualize the power balance of the eight frequency tripling beams.