Abstract: With the rapid development of network application,a large amount of XML data have cxisted,so the style of XML data becomes the primary data and the standard style of data exchanging and representation on Internet. Because of the complexity of external world,the uncertainty is the common internal attribute of data, the uncertain information universally exists. Usually the uncertain information can be represented as the probability values in XML document (probabilistic XML document)，so the research ways of representing and processing the probabilistic XML data will be a new research field. Since 2001, a series of research achievements of the probabilistic XMI_ data management have been obtained. The paper surveyed the research techniques of the probabilistic XML data management including the probabi-listic XML data model, the PXML algebra, query and the prototype systems. The existing problems in the current research work and the new research issues were also discussed.

Key words: Probabilistic XML data, Data model, PXML Algebra, Query, Prototype system