Abstract: Based on the core and experimental data of CBM exploration wells in Jiergalangtu Depression, Jiergalangtu Depression tectonic evolution characteristics, comprehensive analysis of the coal rank, coal rock composition, coal seam thickness, gas content and porosity and other physical conditions were discussed in this paper, determining the advantageous blocks the depression in vertical and horizontal direction. Results show that the 3#, 4# and 5# of Klbs of Jiergalangtu Depression are the main coal-bearing strata in the longitudinal aspect, with a good gas bearing capacity of coal rocks, large accumulative thickness of coal seams, generally good physical properties of coal seams and good enrichment conditions. On the lateral, the depression region of CBM wells in coal seam coal rank, coal rock, coal seam thickness, gas content and porosity were comprehensively analyzed, determining the favorable block of 3#, 4# and 5# seam of Klbs of Jiergalangtu Depression, which is helpful to advance the exploration of the low rank CBM resources in Erlian Basin.