Abstract: The geochemical analysis data of the core and rock debris samples show that high quality lacustrine source rocks are developed in the 1st Member of Pingdiquan formation of Middle Permian in north of the eastern Junggar basin, with kerogen types ofⅠandⅡ1. In order to comprehensively understand and evaluate the source rocks, this paper develops proper the identification and evaluation methods of the source rocks in this area by means of the well log information calibrated by the core geochemical analysis data. The TOC of source rocks is calculated by many methods, such as the modified acoustic?resistivity superposition, the multifactor statistical regression, the petrophysical volume model of source rocks and the differences between the DEN porosity and NMR porosity. The relationship between pyrolysis hydrocarbon S2 and TOC is developed by the geochemical analysis data, by which IH is also calculated. And the source rocks maturity evaluation is based on the relationships between IH and thermal alteration index (ITA), ITA and Ro. Case study indicates that such methods are good for application, and can be as a powerful evidence for estimation of the tight oil resources amount in this area