With the rapid economic growth of china, the issue of national petroleum supplyment security is increasingly focused on and many evaluation methods were used to analyze this problem. In this paper, the method of nonlinear fuzzy was applied to evaluate the security of national petroleum supplyment. Compared with tradition linear fuzzy method, nonlinear method takes into account the particular impact of special factors on evaluation result and promote the validity and rationality of the evaluation. The factors which can influence the security of petroleum resource were analyzed and divided into four classes to establish the factors' evaluation system. Then, the...