中文摘要：

研究了束团压缩中的高阶效应，结果表明存在高阶项的压缩限制，压缩后束团的长度比线性理论值长，初始为均匀分布的束团较高斯分布更易压缩，在相同的加速段与磁压缩器条件下，其所获得的束团长度较短，最后作了数值计算，结果与理论相符．

英文摘要：

This paper studies the high order effect in bunch compressing. There exists the limit of high order effect which is from RF accelerating field and bunch compressor, the bunch length obtained from high order theory is longer than that from linear theory, the initial uniform distribution bunch is easier to compress than the initial Gaussian distribution. Finally, a numerical simulation has been carried out, and the results agree with the theory well.