Abstract : Selecting melamine and formaldehyde as raw materials, the eco-friendly high-etherification melamine formaldehyde resin was prepared through dry method with low formaldehyde, high solid content and high stability. Meanwhile, factors such as ratio of the material in each reaction stage, temperature, pH, were discussed to confirm the optimal preparation condition. The results indicated that when hydroxymethylation reaction stage n（melamine）：n（formaldehyde）= 1:10, reaction temperature was 75 ℃, pH was 9.0, the reaction time was 50 min, and when etherification reaction stage n（HMM）：n（alcohol）= 1:10, the reaction temperature was 65 ℃, pH was 5.5, the solid content of high-etherification melamine formaldehyde resin was higher than 90%, and the content of hydroxyl methyl was 51.4% ,while the free formaldehyde content was less than 0.3%.