Abstract: The evaluation of traps is a part of work in the evaluation of resources of petroleum and gas. The direct effect of evalu- ation of traps is drilling,and the choice of locations of wild cat wells depends directly on the results of the arrangement and the classifaction of traps. This paper describes the double-plane method used in trap arrangement, the right-angie coordination method, respectively in four aspects ,and analytic method ,combination method derived form the two methods described above. The current methods of evaluation of traps have been derived with theoretical refine-nent by means of mathemetical principles. It has produced good effects to evaluate traps in South margin, Junggar basit.

Key words: evaluation of traps, arrangement in order of grades, double -plane method, Junggar besin