Abstract: Shennongjia Mountain is located in the mountainous region of the western Hubei province at about 31°20’-31°30’N with its summit 3105.5 m high near which the rock sea occupying a large area above 2800 m is very conspicuous. We decide that the rock sea was formed in the Wurm. glacial period. In post glacial period, with the vertical zones shifting upwards, the ancient rock sea gradually became steady and was subject to reformation under present climate. Accordingly, we come to the general conclusion that the rock sea line is always 250-350 m lower than the snow line at any time and at any place, and glacier couldn’t be formed in the Late Wurm, because the rock sea was formed at its peak during that period. As a fact, traces of glacier in the Late Wurm in Shennongjia Mountain have not been found.