China has carried out underground coal gasification projects and coalbed methane development projects, but there are problems of low economic benefits. The inclined coal seam in Xinjiang is well developed, and it has favorable geological conditions for the coordinated development of coalbed methane and underground coal gasification. Taking the Baiyanghe mining area in Fukang of Xinjiang as an example, this paper constructs the evaluation index system of geological selection for the coordinated development of coalbed methane and underground coal gasification. The evaluation of geological selection on the basis of comprehensive consideration of the main control geological conditions of coalbed methane and underground coal gasification, is also carried out. The results are as follows: 1) A comprehensive geological selection index system for coalbed methane-underground coal gasification coordinated development has been established, consisting of 9 major categories of first-level indicators and 33 sub-categories of secondary indicators, including geological conditions for coalbed methane resources, coal quality conditions, coal reservoir conditions, rock conditions, and key geological conditions for coordinated development; 2) Based on the analytic hierarchy process-CRITIC method, the evaluation weight of each index is calculated, and it is considered that the gas content, coal seam thickness and permeability are the key indexes. 3) The total area of the favorable area and the sub-favorable area for the coordinated development of coalbed methane-underground coal gasification in the study area is 4.82 km², and it is recommended to carry out engineering deployment in the western and central parts of the demonstration area and the southeastern region.