The decree pattern is suitable for removing hyaluronic acid by injection, and the effect of filling the decree pattern with hyaluronic acid is particularly good. Hyaluronic acid contains 80% collagen solution and 20% PMMA microspheres. After injection into the plastic surgery site, it will be completely wrapped by the slender fiber membrane without any movement and degradation. The characteristics of PMMA round smooth microspheres not only ensure that it is not digested and absorbed by human macrophages, but also ensure that the irritation of PMMA to tissues is reduced to *, and PMMA can also stimulate fibroblasts to synthesize and secrete collagen. After hyaluronic acid was injected into the corresponding part by three-dimensional injection, the two components immediately played a filling role. 1 ~ 3 months later, the injected collagen gradually degrades and is replaced by human collagen.