In this paper, taking Huajiang well as observation object, the temperature gradient test is presented. Through analysis of tidal water temperature response and the seismic response in different layers, the micro-behavior of well water temperature in different layer is preliminarily studied: The water temperature of Huajiang well in speciifc depth can record tide response, but tide can not display directly, which possibly because the water temperature gradient value is much smaller; The water temperature change caused by the water level is small, and the high frequency noise is on the contrary bigger, affecting the recorded tidal phenomenon. With increasing depth in Huajiang well, the capacity of well water temperature for recording coseismic response becomes more better.%以荣昌华江井为观测对象,开展详细的水温梯度测试.分析不同深度段水温潮汐响应和同震响应,统计该井不同深度处井水温微动态特征,认为:荣昌华江井特定深度段的水温能记录到微弱潮汐响应,可能是因为井水温梯度较小,水位变化引起的温度变化较小,而高频噪声相对较大,影响该井记录潮汐现象;随着观测深度的增加,荣昌华江井水温记录同震响应的能力增强.
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