Vitamin C ethyl ether is a very useful derivative of vitamin C, which is not only very stable in chemical substances, but also a derivative of microorganism C without discoloring, but also a amphiphilic substance, which greatly expands its application, especially in daily chemical applications. 3-o-ethyl ascorbic ether is easy to enter the dermis through the stratum corneum, and it is very easy to enter the body after the enzyme decomposition in order to play the biological role of vitamin C.