Abstract: Based on the theory of circulation of qi, a theoretical model of the circulation of phase fire in the human body was constructed. It is proposed that cancer toxicity is the key factor that triggers the disorder of phase fire and hinders the circulation of phase fire. The disorder of phase fire and poor circulation are important pathogenesis of the occurrence and development of cancer toxicity. With the principle of strengthening healthy qi and eliminating evil qi, the Wenzi Jiedu method is used to treat tumors, which plays an important role in warming and nourishing, regulating yin and yang, and eliminating cancer toxicity. The combination of warming, nourishing and detoxification can promote the return of the phase fire and make the human body's generation and transformation active, providing a new treatment idea for TCM diagnosis and treatment of tumors with mainly cold poison or mixed cold and heat.