Abstract: Based on unconventional oil and gas formation features,distribution features of the shale gas blocks and the domestic and overseas oil and gas developme nt experiences,a valuation idea of the' multi phases,multi resources and multi gas' combined exploration and development was provided. Based on the different gas formatio n features of Ordos Basin,Sichuan Basin and other type gas formation distribution features as the examples,the paper introduced the application ideas. The coalbed metha ne,shale gas,compact sandstone gas and conventional oil and gas would be distributed in above basins. In the partial regions,the formations would be vertically overlaid. P reviously each gas formation was independently explored and developed,thus the geological information would be overlapped and the exploration evaluations would be rep eated. The idea provided would be the decision references to the study on the new block( such as the shale gas block). In order to reduce the exploration cost and to reduc e the repeated work,the study should be fully conducted on the' multi phases"of the geology and the planning engineering. The geological"multi resources' 'should be clarifie d,the engineering"multi resources 'should be optimized,the geological“multi gasses' 'should be analyzed and the engineering“multi gasses' 'should be promoted.