Abstract: This paper aims at the characteristics of conceptual twophase resistance of debris flow. It uses the conceptual twophase resistance for a static analysis on accumulation state of debris flow. As a result,a formula for accumulation state of debris flow in general condition is presented. Furthermore,the characteristics of accumulation state of debris flow in different conditions are discussed. The analysis shows that it is reasonable to model the resistance term with the conceptual twophase resistance. It also indicates the complicated structure composition and reflects veritably the real accumulation state of debris flow. Under a given material condition,the conceptual twophase resistance term transforms into the resistance term of single material. The corresponding conclusion obtained is identical to the existing conclusion of analysis on a single material．