本文提出了一种新的Fourier分析反卷积方法。采用这种方法分析了自1900年以来的极移运动,给出了Chandler摆动周期和振幅的变化过程。分析结果表明,Chandler摆动周期确实是与振幅相关的,振幅变大时,周期变长。对此现象的地球物理机制解释是,它可能是由于非平衡极潮所引起的。 This paper presents a new Fourier analysis deconvolution method. This method has been used to analyze the polar motion since 1900, and the variation of the Chandler oscillation period and amplitude has been given. The analysis results show that the Chandler swing period is indeed amplitude-dependent, and when the amplitude becomes larger, the period becomes longer. The explanation of the geophysical mechanism of this phenomenon is that it may be caused by non-equilibrium extreme tide.