The Third High Tide of Astronomical Site Selection in China and Primary Estimation of Astronomical Observation Conditions at Gaomeigu Lijiang Yunnan

The background and development of the third high tide for astronomical site selection in China are introduced in ibis paper. According to the astronomical climate survey obtained, it is possible to pick out some good astronomical sites in China. Some resultS of primary survey and measurement at the North China and North-West China are reported. The course of site survey at the west Yunnan province and observation at Gaomeigu, Lijian County are also introduced in detail. According to primary results from cloudage observation and seeing measurement by using the DIMM, Gaomeigu is a potential good site for astronomical use.