With the designed continuous phase plates (CPP) by improved G-S algorithm, the focal spot shaping ability, 3ω conversion efficiency and near field intensity modulation for two kinds of CPP were analyzed. It included that 1ω CPP can meet focal spot shaping requirement compared to 3ω CPP. With the KDP crystals by “Ⅰ+Ⅱ” styles, 3ω conversion efficiency is impacted larger when the disarrange angle being larger, and the degree is related with focal spot size; the more 3ω conversion efficiency impacted, the stronger near field intensity modulation will be. The result can instruct CPP application for TIL facility.