Abstract: Massive amount of data are expected to be generated after the start of the operation of the 2.4 m optical telescope of the Yunnan Observatory. As future scientific results are based on these data, the data management is an important part of telescope operation. In order to safely preserve and efficiently utilize these data, we build a data management subsystem in the remote observing system of the 2.4m telescope. This version of data management subsystem incorporates the following functions: data compression, data archive, real-time data browse, data search, data download, and more. The subsystem is built in the environment of Linux+MySQL by using the J2EE technique.