In this paper,we revise the algorithm of Chomsky normal forms of book written by Harry R Lewis and Christos H Papadimitrion,and complete the program for the algorithm.

• 本文指出了Harry R Lew-is；Christos H Papadimitrion的著作在定义Chomsky范式算法中的若干不妥之处；并进行了修改；且实现了Chomsky范式算法的程序.