中文摘要：

<正>We compare the twist-2 and twist-4 parton distributions both in integrated and unintegrated parton distributions.We find that when x decreases the difference between the twist-2 and twist-4 parton distributions become obvious except for the valence quark distributions.We hope the future experiments may distinguish whether the twist-4 correction is needed or not and select a reasonable unintegrated parton distribution model.

英文摘要：

We compare the twist-2 and twist-4 parton distributions both in integrated and unintegrated parton distributions. We find that when x decreases the difference between the twist-2 and twist-4 patton distributions become obvious except for the valence quark distributions. We hope the future experiments may distinguish whether the twist-4 correction is needed or not and select a reasonable unintegrated parton distribution model