中文摘要：

利用扭度-4修正后的Dokshitzer-Gribov—Lipatov—Altarelli-Parisi（DGLAP）方程，结合HERMES的实验数据，计算出了领头阶情况下极化结构函数g1以及不对称性A1，讨论了扭度-4对核子自旋结构函数的影响．

英文摘要：

This paper calculated the proton and neutron spin structure function g1 and the asymmetry A1 with modified DGLAP equations which considered twist-4 effects. With the HERMES experiment data, we discussed twist-4 effect in polarized structure functions.