In order to decrease VOC,acid epoxy clear coating is put into use instead of acrylic clear coating,but the viscosity stability of the former gets worse to some degree,so it is divided into A ingredient and B ingredient as a creative solution.Pre-mix system could not only realize the precise ratio of A ingredient to B ingredient at 16:15,but also mix uniformly.As further noted,the article discusses the logical relationship,parameter,mistake-proofing design,as well as daily maintenance management,and points out that the new pre-mix model has extensive applicability finally.