Based on the distribution of run feature and rank difference feature of coding sequence, this paper proposed a method to identify the type of common coding sequence. Using the concept of run distribution in combination with analysis of random nature within the coding sequence, it can be distinguished that if the encoding type belongs to block codes or others. Based on the structural features of turbo codes, rank difference analysis following the split of the coding sequence can distinguish the encoding type from convolutional and turbo codes. Herein we describe simulation experiment, the results of which demonstrate the validity and applicability of the proposed method.