With the development of advanced semiconductor technology, the requirements for materials are pushed to be very specific and extreme. More and more new polymers are used in lithography and other areas, and some of these polymers contain elements other than C, H, and O, such as nitrogen, phosphorous, sulfur, fluorine, bromine, iodine, boron, silicon,and so on. These polymers have received much attention because of the unique functions that they can provide. TheOhnishi parameter is a basic function of polymer structure and plasma etch rate derived from sputtering yield and the composition of C, H, and O in a unit volume [3]. Much research has been done to study the etch properties of different new polymers, but no clear theory shows how to put atoms other than C, H, and O into the etch equation.