Approach to virtual observatory in Yunnan Observatory

Since 2001, we have started to do some works on how to approach to virtual observatory in Yunnan Observatory. We have finished a prototype distributed controller of CCD camera, we have established a search engine for 2MASS database, and we have finished a prototype system of data archiving, browsing, searching for H-alpha image data of the sun, etc. Based on these efforts, we are trying to use up-to-date IT technologies to unite all these efforts, and integrate both astronomical database and astronomical instruments into a Virtual Observatory.