Abstract: To determine the best formulation and process conditions of high molecular drag reducing polymer, L₁₈ (6¹×3⁶) orthogonal testing program was used.which needs less testing times, but the factors and the levels of each factor was fully studied. By means of analyzing the orthogonal testing data.the inherent law of the test was observed, that is, how did each factor affect the drag reducing rate of the polymer, which includes the type of α-olefins, the type of supplementary catalyst, the proportion of major catalyst, the ratio of major catalyst and supplementary catalyst and the temperature.