A simulation program is finished for applying the optical parametric chirped pulse amplification (OPCPA) technique to the high energy perawatt laser system. Taking periodically polarized LiNbO3 optical parametric amplifier as an example, the influence of noncollinearly angle, crystal length, gain bandwidth and high-order nonlinear effect on the front end OPCPA under quausi-phase matching conditions is analyzed. This work provides theoretical and experimental reference for the design and application of OPCPA.