It is a well-known fact that the geochemical modeling is a useful tool for geothermal exploration. In Taiwan, four higher geothermal potential areas, including Tatun, Ilan, Lushan and Hwa-Tung, have been identified based on the data of reservoir temperature and geothermal gradient by silica geothermometer and the temperature profile of drill wells. This is the first application of the multicomponent geothermometer in geothermal area to understand the flow path of fluid from reservoir to surface and evaluate the reservoir temperature in Taiwan. We collected groundwater and hot spring samples from the southern foothill area of Ilan Plain and Chingshui geothermal area for chemical and isotopic analysis. The estimated reservoir temperatures are 33-121��, 33-160�� and 151-248�� in the southern foothill of Ilan Plain and Chingshui geothermal area, respectively. Isotopic results show that water samples taken for this study are above the local meteoric line. However, isotopic values of the foothill area are much scatter than that of Chingshui geothermal area indicating various sources of precipitation. On the other hand, isotopic values of the Chingshui geothermal area are much more influenced by heat. The results of the multicomponent geothermometer of this study with chemical analysis demonstrate that this geothermometer not only can estimate the reservoir temperature but also may implicate the fluid flow path.

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