On the basis of observed data of groundwater temperature changing in former Soviet Union nuclear pover station, the formation of technological origin ground thermal field and its distribution and bad geological phenomenon which might be led were studied preliminary in this paper. The calculative formula of water temperature increment was advanced, thermal stress may be formed in great temperature difference zone and then ground thermal mechanical process was produced, which caused ecological impact. Author suggests that long-term dynamic observation of the technological origin ground thermal field must be launched to forecast its developing trend, and control effectively developing of corrode process.