Condensed oil is an important component of future new production. More and more deep condensate gas fields (reservoirs) are being discovered, demonstrating their potential for large-scale development. However, there are few researchers on the deep condensate oil resources evaluation, and the evaluation parameters are different from those of traditional hydrocarbon, so the evaluation methods and parameters need to be improved. The western Junggar Basin is the target area. On the basis of conventional hydrocarbon resource evaluation, the lower limit of condensate gas reservoir occurrence (gas-oil ratio, critical temperature, critical pressure, maximum condensate temperature, etc.) is determined by dissecting key parameters of condensate gas reservoir, and the distribution range is clarified, so as to carry out condensate oil resource evaluation in the western Junggar Basin. The new condensate oil resource evaluation method and parameters system were established based on genetic, and it was pointed out that the four evaluation units in the western Junggar Basin contained 2.57 × 108t of potential condensate oil resources and 2.01 × 108t of stable condensate oil resources. Our findings provide a new method and idea for the condensate oil resources evaluation.