ABSTRACT: Hydrothermal alteration zones have been, investigated by X-ray diffraction techniques and geochemical methods in thisa study at Kütahya region. There are Cfalorite-tllite,. Montmorillonite, Calc AHminiuni silicate1 and silisification zones in investigated area.., As a result of these studies; Abide geothermal field has 180-230 °C, Naşa-Eynal geothermal fields have 100- 160°C in Simav region, Tavşanlı region has 100-160°C, Emet region has 150-200 C, Kütahya-Bıca field has 100-160°C temperature1 geothermal fluid has been found.