以频谱分析方法作为理论基础，采用周期图法计算汶川地震前后距震中500km以内10口观测井水位（包括动水位与静水位）的功率谱，对比分析2009年无大震年份同时期的数据，研究结果表明：水位的频域特征受制于观测井的地质构造背景、观测方式和观测深度；水位的波动能量主要集中于大于4天与小于0.5天周期，震后水位波动能量则集中在大于8天的周期；动水位频谱更加丰富。另外，不同井水位的频域响应特征与该井观测层岩性有关，仍需进一步研究。

This study based on the spectrum analysis theory, adopt periodogram method to calculate the power spectrum of 10 stations, which close to the epicenter of the earthquake(<500Km) and include both hydrostatic level and dynamic water level. Compared the result calculated in the same way depended the data in 2009, we could find that: 1)the spectrum feature of water level is controlled by geological structure, observe method and depth; 2)the power of the fluctuate concentrate on the period longer than 4d and shorter than 0.5d, but focus on longer than 8d after the earthquake; 3)the power of dynamic water level fluctuation is more even among all periods than hydrostatic level. In addition, the spectrum feature of various stations also is related to its hydrological geology surrounding, and the relationship is remain need more study.