Based on the nature, Wang Tang-nan analyzes metaphysical philosophy into nature and conscience. The nature body does not act, which serves as the principal part, the undeveloped and the innate part. The act is for utilization, development and the learned. The conscience is based on the nature and controlled by chi. It is the key from body transited to utilization. In the interpretation of Wang Tang-nan, the conscience has the meaningful destruction and is ascended to undeveloped constant tranquil nature. The ability to act is obvious and can only be maintained in the completeness where nature exists. Extended to the practice, it is developed as the path of practice. In the relation between developed and undeveloped contrast, understanding is the virtual realm of the former life. Study is the developed mean, which contrasts to the saying of unpreparedness by Wang Tang-nan. Superficially, it is the deviated view of conscience; in fact, it has departed from the main point of innate knowledge. It has developed out from the mental science in ideas and becomes the school of emphasis of nature. In the kongfu path, it reverses into the path of practice from the method of Wang Yang-ming.