Strengthening the body resistance and eliminating pathogenic factors are two interrelated aspects. Strengthening the body's resistance is to eliminate evil spirits. By strengthening the body resistance and eliminating evil spirits, we can go out and restore health, which is the so-called "recovering evil spirits from the body" Eliminating evil means strengthening the body resistance and eliminating evil, achieving the purpose of protecting healthy qi and restoring health, which is also called "eliminating evil and protecting oneself". Strengthening the body resistance and eliminating pathogenic factors are two complementary aspects. Therefore, when applying the therapeutic principle of strengthening the body resistance and eliminating evil, we should carefully analyze the contrast between the strength of good and evil, distinguish between primary and secondary, and decide whether to strengthen the body resistance or eliminate evil, or decide the order of strengthening the body resistance and eliminating evil. In general, strengthening the body resistance is used for deficiency syndrome, and eliminating pathogenic factors is used for demonstration. If it is a syndrome of excess and deficiency, it should be combined with strengthening the body resistance and eliminating evil. However, this kind of consideration is not equal to strengthening the body resistance and eliminating evil, but to distinguish between the priority of reality and excess, so as to determine the priority of strengthening the body resistance and eliminating evil. In short, we should take the principle of "strengthening the healthy energy without leaving evil, eliminating evil without hurting positive energy". In the clinical application of the principle of strengthening the body resistance and eliminating pathogenic factors, we should carefully observe the growth and decline of pathogenic factors, distinguish primary and secondary according to the different status of both parties in the disease process, and use them flexibly. Details are as follows:

1. Fuzheng is suitable for deficiency syndrome with positive deficiency as the main contradiction. For example, qi deficiency and yang deficiency should be supplemented with qi and yang; Yin deficiency and blood deficiency syndrome should be treated by nourishing yin and blood.

2. Eliminating evil is suitable for empirical research with the reality of evil as the main aspect of contradiction. The commonly used methods in clinic, such as sweating, vomiting, diarrhea, clearing away heat, promoting diuresis, promoting digestion, promoting qi circulation and activating blood circulation, are all formulated under the guidance of this principle according to the different conditions of pathogenic factors.

3. eliminate evil before strengthening the body, that is, attack first and then make up. In the mixed syndrome of insufficient positive energy and excessive evil energy, positive energy is weak, but it is resistant to attack. If you strengthen healthy energy at the same time, you will retain evil energy. At this time, it is advisable to eliminate evil energy first and then strengthen positive energy. Such as metrorrhagia and metrorrhagia caused by blood stasis, because the blood stasis does not disperse and the bleeding does not stop, it is necessary to promote blood circulation and remove blood stasis first, and then replenish blood.

4. first strengthen the body and then eliminate evil, that is, first make up and then attack. Adapting to the deficiency of yang, the body can not tolerate attacking and cutting the syndrome of excess and deficiency. At this time, it is considered that exorcism will hurt righteousness, so we should first strengthen the righteousness, help righteousness, and eliminate righteousness when righteousness can tolerate attack and cutting. For example, stomach distension, when the lack of vital qi is the main aspect of contradiction, when the lack of vital qi can not tolerate attack and cutting, we must first strengthen the body's resistance, and then purify its evil spirits when it can tolerate attack and cutting to avoid accidents.

5. Combination of strengthening the body resistance and eliminating evil, attack and supplement simultaneously. It is suitable for the syndrome of excess and deficiency that cannot be simply eliminated or simply strengthened. At this time, eliminating evil alone will hurt righteousness, and strengthening righteousness alone will save evil. Because there are primary and secondary differences between reality and excess, there are also primary and secondary differences when attacking and supplementing. It is a combination of strengthening the body resistance and eliminating pathogenic factors, that is, strengthening the body resistance and eliminating pathogenic factors, which is suitable for the syndrome of excess and deficiency with the deficiency of positive energy as the main factor; First, eliminating pathogenic factors and strengthening the body resistance, that is, eliminating pathogenic factors and strengthening the body resistance, is suitable for the syndrome of excess and deficiency with pathogenic factors as the main factor. For example, for a cold with qi deficiency, if qi deficiency is the main factor, and only the easy love and aversion are corrected, it is necessary to give priority to invigorating qi and relieving exterior symptoms; If the pathogenic factors are dominant, attacking the pathogenic factors alone is easy to damage health. At this time, the focus of treatment should be on eliminating pathogenic factors and strengthening the body resistance.