Abstract: The coefficient of hydrocarbon accumulation is the key parameter for hydrocarbon resource evaluation.Various references have showed that satisfied technology series have not been created although there have been a number of research methods of hydrocarbon accumulation coefficient.This paper discussed the method of hydrocarbon accumulation coefficient determined by multifactor colligating,which primarily integrated geological research with the Folk-Ward Method and the Method of Exploratory Well Statistics in Grid,and given the application to the 3rd hydrocarbon resource evaluation of the Dongying Sag in the Jiyang Depression.