Abstract: This paper deals with the distribution of carbon-dioxide discharging localities in China (where CO₂ gas content is >90% and water with dissolved CO₂ >1g/l or with bicarbonate more than 1g/l), characteristics of water quality and the seismic activities of various carbon-dioxide discharging zones. The source of CO₂ fluids is also studied herein. It is suggested that the highly seismic activities are mostly associated with the zones of warm and hot springs rich in carbon-dioxide, but scarcely with the zones of cold carbon-dioxide springs. Warm and hot carbon-dioxide springs occur mainly in seis-mically active zones with strong neotectonic movements, such as in southern Xizang (Tibet) where the highly seismic activities are accompanied with regional metamorphism. Moreover, in area of heat flow anomaly probably there also occurred magmatic intrusion which brought about contact metamorphism and through all of these processes carbon-dioxide may be released. Cold carbon-dioxide springs are discharged in seismically less active zones, such as in Northeast China, where tectonic movements and magmatic activities became gradually quiescent. Carbon-dioxide appears to be released slowly from magma which cooled down under a relatively closed condition in the post-volcanic period, and it miaght be the released gases conserved in the altered surrounding rocks affected by volcanic magma. Meanwhile, the cold carbon-dioxide springs originated by mixing CO₂ fluid with shallow groundwater.In the seismically active zones within depressions subsides since Cenozoic time, such as in North China, the warm and hot carbon-dioxide springs have not been found at the ground surface, owing to the thick covers, but in the case of deep-seated ground-water hot carbon-dioxide water was discovered. Intensive studies of the origin and distribution of CO₂ fluids will be significant to understanding the recent stress field, seis-micity and regional metamorphism. It must be stressed that great effort must be made in the studies of mountainous areas, such as the Kunlun-Szechuan-Yunnan, Tienshan, Chilien. Moreover, the analysis of stable carbon isotopes from discharges of CO₂ fluids should also be carried out.