This study aims to analyze the main factors influencing the development of English new words.Language is always changing,especially at the late period of 20th century.Times change,develops very quickly.Every year,the growing number of new words and new meanings are in English vocabulary and can enter to database about 1500-1600.The main factors for this are the development of science and technology and economy,the instability of the world situation and politics in different countries,and the change of social life.In order to suit this new situation,people have created numerous new words.It is good for English learners to keep up with the development of English new words.