Acquisitioning periodicals online is a new mode for libraries. It has five procedures, namely information retrieving by net, choosing and booking, document delivery, confirming orders, and electric payment. Comparing with traditional acquisition of periodicals, the online acquisition of periodicals has many advantages, such as the tremendous information, the straightness, the high efficiency, and spanning time and space. The online acquisition of periodicals in China's libraries is a new mode

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... peared in recent years. In the traditional acquisition mode, librarians firstly collect the information of periodicals published by presses, then choose some periodicals and input the main items, such as the name, author, ISSN, price, that describe relevant periodicals into the computer system of libraries. Finally, librarians have to send the filled orders to presses. Today under the network environment, libraries' online acquisition of periodicals is guaranteed by technologies. Amounts of information on periodicals are provided by numerous presses online, what serve as the information source of online acquisition. Besides, the standardization and normalization of data of periodicals, and the share of information of periodicals have become important in periodicals' acquisition. Because of the online acquisition, the way of acquisition, and its content and scope have been changed a lot. It has important significance to study and analyze these changes, which can help to improve the quality and efficiency of libraries under the network environment. Periodicals' online acquisition refers to the whole process in which librarians research, retrieve, download the periodicals' information from the net by computers, and order the needed periodicals according to the situation in their libraries, and pay for their orders. Combine the direct-order method and the pre-order method together Libraries can adopt both direct-order method and pre-order method to perfect their storage. For different periodicals, Vol. 3, No. 5