中文摘要：

脉冲星具有非常稳定的累积脉冲轮廓，特别是毫秒脉冲星．前人研究发现一些脉冲星的累积脉冲轮廓会呈现出不稳定性．研究了毫秒脉冲星PSRJ1022＋1001累积脉冲轮廓的稳定性问题，该脉冲轮廓有两个峰，发现其峰值比随时间有明显的变化．通过分析，认为该毫秒脉冲星累积脉冲轮廓的不稳定性主要是由于脉冲轮廓随观测频率变化，同时星际闪烁造成不同频率上流量密度变化．研究还发现，也有少部分累积脉冲轮廓的变化可能是脉冲星内禀或其他因素所引起的．

英文摘要：

Normally, pulsars, especially the millisecond pulsars, have stable integrated pulse profiles. Previous studies found that a few pulsars show an instability in their profiles. In this article, we research the stability of the integrated pulse profile of PSR J1022＋1001. The profile has two peaks, and the peak ratio significantly changes with time. The analysis suggests that the instability of the integrated pulse profile of the pulsar is mainly due to the evolution of the pulse profile with frequency, meanwhile flux density varies with frequency caused by the interstellar scintillation. The study also find that the instability of small part of pulse profiles may be due to the intrinsic characteristics of the pulsar or the other reasons.