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由一元线性回归分析的正则方程计算表明，在验潮记录较短的客观条件下，验潮序列中的周期波动对确定海平面变化趋势的影响是显著的。着重讨论采用数字滤波方法消除周期小于４年的短周期波动对确定海平面变化趋势的影响，并设计了最平滤波器，其通带截止频率对应的周期为４年，即应用最平滤波器对月均验潮序列进行低通滤波，基本上可消除周期小于４年的短周期波动对确定海平面变化趋势的影响。
The regular equation calculated by the univariate linear regression analysis shows that under the objective conditions with short tide records, the periodic fluctuations in the tidal range series have a significant impact on the determination of the sea level change trend. This paper focuses on the effect of using digital filtering method to eliminate short-period fluctuations of less than 4 years to determine the sea-level change trend. The most flat filter is designed. The passband cut-off frequency corresponds to a period of 4 years, The low-pass filtering of the monthly mean tide-accretion sequences can basically eliminate the impact of short-period fluctuations of less than 4 years on the determination of the sea-level change trend.