According to the thermal decomposition analysis achievements of the mudstone, carbonaceous mudstone and coal samples gathered from the Lower Cretaceous coal measure strata of Well Bincan 1 and Well Sui D1 in the Suibin Depression, this paper analyzes the organic matter abundance, type and maturation with TOC, S1 (the absorption hydrocarbon), S2 (the hydrocarbon of kerogen decomposition) and IH (Hydrogen Index, S2/TOC). An absolute majority of samples have the ranges of organic richness from medium level to high level. The results of above analysis indicate that the Lower Cretaceous coal measure strata of Suibin Depression, including the Lower Cretaceous Chengzihe Formation and Muleng Formation are the coal measure source rocks with a high hydrocarbon generating potential.