Using a three-dimensional spatial and temporal numerical model, optimization design of 1 J-level optical parametric chirped-pulse amplification system with type I noncollinear phase matching structure is discussed. With the two LiB3O5(LBO) preamplifiers and one YCa4O(BO3)3(YCOB) power amplifier, highly stable, high-conversion-efficiency and good beam quality signal output is got by shaping the pump beam′s spatiotemporal profiles to super-Gaussian shapes, using the walk-off compensation structure and choosing the crystal′s length on each stage. This design can meet the requirement of SG-Ⅱ upgrade project′s front-end.