This paper introduces the principle and classification of picture archiving and communication system (PACS) and some pertinent technologies, including the capture methods of pictures data, images storage equipment and the choice of medium, and the network of images transmission. Also presented is an analysis of the merit and demerit of different kinds of PACS, and in the end we put forward a PACS design method and network framework based on practical implication in the Jinwei project experimental hospital.