| The applications of the geothermal system have been largely utilized in direct uses for long time in China; and less indirect use for generate power electricity. Curative properties of geothermal waters are highly valued in several places in China. For that China occupied the first position in the world in many direct uses of geothermal system, such as balneology green houses, ground heating (heat system), swimming pool, drying wood, mineral water industries and the research of the geothermal has been developed by using a new tools of chemical analysis, the chemical investigation of steam condensates, hot spring waters, gas vents analysis should be before conducting any geochemical or geophysical prospecting campaign, a preliminary reconnaissance survey describing the location, geological setting of thermal emergences, and type of manifestation should be conducted. Hot springs and fumaroles widely distributed in Yemen, with varies chemical composition and high mineral content which is believed to use for several proposes, such as balneology, mineral water industry, swimming pool. Green houses therapeutic-healing, drying fishes, aquacultures. Hot springs, fumaroles and gas vents in the study area (western Yemen), emergence from sedimentary, metamorphic rocks but the majority has been founded emergence associated with igneous centers of Tertiary and Quaternary volcanic fields in western Yemen provinces, where several earthquakes and landslides have been occurred, structurally these volcanic complexes are connected to N-NW faults that are parallel to the main Red Sea trend, the hot springs locations associated with Tertiary felsic intrusions, related to the NW-SE, E-W and NE-SW trending faults which parallel to the main Red Sea trend and the Gulf of Aden, Temperature and pH values of the thermal spring range between 37 °C and 96 °C, and 6.3 and 8.7, respectively. However, the condensates collected from fumaroles and steaming ground have low pH values (<4.5) and TDS (<250 ppm). The western Yemen hot springs belong to tow type of waters which they are Na-HCO3 and Na (K)-Cl, whereas the surficial waters have the typical worldwide Ca (Mg)-HCO3 composition. The relationship between the types of hot spring waters related to the magma chamber in depth and the chemical composition of the volcanic rocks. The chemical composition of several hot springs around Changbaishan area has been investigated, where widely Cenozoic basaltic rocks are distributed in northeast China, and geothermal characteristics have been described. Around one hundred hot springs exist around Changbaishan volcano at the border between China and North Korea with high temperature around 83.2°C. The pH values of the spring waters range from 3.34 to 9.68 and the total flow rate is about 4.8 l/sec. The chemical composition of the thermal springs is sodium carbonate; which is derived from the chemical processes (water-rock reaction) during the ascending of the hot water from the reservoir to the surface either between the CO2 Which from magma originally ( volatile gases) and the mineral of the volcanic basaltic rocks, and the high-mineral contents of thermal water are believed to have medicinal properties, bathhouses are already built along the hot springs to take the advantage of the supposed healing properties. The high quality of those hot springs is believed to be utilitized for mineral water balneology heat system and exploited the CO2, gas. The chemical equilibrium temperatures were estimated at about 160°C based on the Na-K-Ca geochemical thermometer. Geothermal field in Anshan area includes numerous thermal well springs emergence from the Quaternary deposits which overlies on Proterozoic metamorphic granite rocks with temperatures ranging from 49 °C to 96 °C, and the pH values of water ranging from 8.74 to 9.02. The type of the geothermal water is Na (K) -Cl-S which can be use for either Heat system for the Anshan city or for therapeutic healing. Geothermal system of Yemen and China have occurred between the plate boundaries as the geothermal in the world have been founded in the plate boundaries, Yemen occurred between the Arabian plate andAfrican plate boundaries, and NE China geothermal has been founded on the seduction of the pacific ocean. In the Gulf of Aden region the heat flow varies from 50-100 mW/m2. The present geothermal gradient in the Red Sea region ranges from 49 to 77 °C/km, (data collecting from deep drilled wells more 3000 m) and the present heat flow varies from 94 to154 mW/m2. Such high and moderate heat flow values have more or less been affected by the thermal equilibrium between the upper mantle and the crust. The geothermal gradient in NE China varies from 35 to 70°C/km, and the heat flow in the Songliao NE China is 40 to 88 mW/m2 . The present study on the hot springs in Yemen and NE China reveals there are relationships between the Type of the Hot spring waters and the Geological composition, where the type of the hot springs water derived from the chemical composition of the geological rocks when ascending to the surface through them ( water-rock interaction). The hot springs locations with the earthquakes and landslides have strong relationship with tectonic structures in both Yemen and NE China. Equilibrium temperature evaluation of the thermal reservoirs has been performed by using different liquid phase geothermometers, such as, SiO2, K2/Mg and Na/K. Estimated reservoir temperatures range between 70 and 140 °C. Western Yemen shows a good potential with subsurface temperatures around 150°C in the Al Lisi-Isbil geothermal field in Dhamar area and Mosh Al-Kafer (Ibb area) in Western Yemen, NE China also has the same potential the two areas can be use for producing power electricity with subsurface temperature around 160°C. Sana'a area hot springs in western Yemen belong to Ca-Mg-HCO3 –Cl type of water, which maybe derived to the reservoir rocks (Amran limestone group), the field of Hammam ( H.) Jabal Almayeen H. Ali, H. Al-Hara 1,2 and H. and W. (Wadi) Siham aggregated at the same zone and extending to H. As Sokhnah in Al...
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