Early preparation for hair transplantation: some basic knowledge about transplantation should be understood before hair transplantation. 1, general hair loss is not suitable for surgery when it is obvious; for shedders, generally hair loss stable less than 50-70 roots / day, you can consider surgical treatment; 2, if the hair loss caused by burns, burns, trauma, etc., at least six months after the trauma healing before considering surgery; 3, there are chronic diseases need to be treated for the disease first.