Based on the analysis of geological condition of underground coal gasification and advantages and disadvantages and application condition of different underground coal gasification technology, combined with the coalfield geological features of Xiacang, Yuelongzhuang, Wuqing-Jinghai etc. 6 mining area of Tianjin City, the appropriation of underground coal gasification in mining area was studied. The result showed that the western Jinghai is the most appropriate area for no well type underground coal gasification. Combined with the actual situation, the relative plan was made, oxygen enrichment –CO2 gasification technology was adopted, economic analysis of the area underground coal gasification project was made.