Abstract: This papev puts forward four factors which restricts the quality of book picking/book subscriptions/book dupli- cate checking, makes a analysis of current commonly used three kinds of book picking＆ rechecking mode ac- cording to the four factors, points out that internet real-time duplicate checking is the development trend of the library and cloud computing, the 4G network and the two-dimensional code technology will take the role of promoting its popularization.

Key words: duplicate checking; cloud computing; 4G; two-dimensional code