A primary study on the organic matter of the sediments from sedimentary basins located in northern Hebei and western Liaoning Provinces shows significant differences both spatially and temporally in the abundance and composition of organic matter over these sediment basins. The Dabeigou Formation which represents the earliest sediments of early Cretaous time in the Luanping Basin has a lowest organic abundance, indicating that, although the Dadianzi Formation which developed a little later shows the change in the sedimentary facies and the type of organic matter with increase in the abundance of organic matter, the paleoclimate and environment were not favorable to the development and accumulation of organic matter. By the time of the sedimentation of the Qiaotou and Yixian Formations, the abundance of organic matter was in great abundance, suggesting that the organisms were thriving and that a mild and warmer paleoclimate and environments were favorable to the organic matter Formation and accumulation. However, cold climate occurred frequently and the true reason for this need further investigation.