As the name implies, the word "nourishing" in the six-character formula for health care shows whether the six-character formula is nourishing or not, and the whole practice process of its whole set of techniques embodies the core content of "nourishing". Master Ma Litang also emphasized many times before his death that "the six-character formula is a tonic, not a diarrhea". There have always been different views and opinions on the problem of reinforcing and reducing in the six-character formula of health preservation. So that some beginners are puzzled and at a loss.