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Geothermal heat-pump can be applied for both/ either space heating and/or cooling depending on surface and underground temperature conditions. Although space cooling is needed tropical countries where the atmospheric temperature is almost stable through a year, subsurface temperature may always be higher than atmospheric one because of geothermal gradient, and there is no thermal merit of geothermal heat-pump system. However, still there is a possibility of thermal merit for tropical regions if 1) seasonal change of atmospheric temperature exist, 2) daily change of atmospheric temperature is rather high, and/or 3) the cooling effect of recharging groundwater flow on subsurface temperature is locally dominant than the heating effect of heat flux from a depth. Thus to understand local underground temperature distribution may be the first step for an intensive installation of geothermal heat-pump system. For this purpose, vertical temperature profiling of observation wells were widely measured in ChaoPhraya Plain, Thailand. It is known that subsurface temperature distribution is generally affected not only by thermal conduction but also by advection owing to groundwater flow (Uchida et al., 2003). The effect of thermal advection is especially large in shallow sedimentary layer with high groundwater flux. Groundwater temperature measured in an observation well is assumed to be identical to subsurface temperature, because there exists thermal equilibrium between the water in a borehole and its surrounding subsurface layers. Temperature profiles are one-dimensional sequential data arrays so that areally distributed temperature profiles provide three-dimensional subsurface information. Fig.1 shows groundwater flow system and subsurface thermal regime (modified form Domenico and Palciauskas, 1973). If there is no groundwater flow or static groundwater condition (Fig. 1a), subsurface thermal regime is governed only by thermal conduction and subsurface temperature gradient is constant (Fig. 1b). When a simple regional groundwater flow system due to topographic driving (Fig. 1c) is assumed, thermal regime will be disturbed by thermal advection owing to groundwater flow (Fig. 1d). In the groundwater recharge area, subsurface temperatures and gradients are lower than that of under static groundwater condition (Fig. 1b). In the discharge area, on the other hand, temperatures and gradients are larger than that of under static condition. Uchida et al. (2003) compiled shallow subsurface temperature-depth profiles at depths from 30 m to 300 m in selected Japanese basins and plains. They classified thermal data sets into four categories depending on Subsurface Thermal Regime in the Chao-Phraya Plain, Thailand