Abstract: With data of extracts and carbon isotope(δC¹³), the compositional features of carbon isotopes in the various source rocks and crude oils from Daqing are studied In contrast with crude oil of marine origin, the Daqing oil, which is divided into three types, is formed of terrigenous source materials. Through correlation of carbon isotopes in source rocks and crude oils, it has been identified that the crude oil in Heidimiao comes from No 1 Nenjang Section; the oil in Saertu, Putaohua and Kaotaizi Formations from Qingshankou and the oil in Fuyu and Yangdachengzi from the lower part of No. 1 Qingshankou Section. The direction of oil and gas migration in the Daqing oil field and the depressions on its flanks are also dealt with, taking the pool in Putaohua for illustration.