The present paper is a continuity of professor Wu Cheng-yi's work "The Regionaliza-tion of Chinese Flora". Based opon recent statistics and analysis of total spermatophytes in Xizang, 6 plant regions may be divided. They belong to 3 subkingdoms of 2 kingdoms. The south Himalaya slope of Xizang is a part of Malaysian subkingdom in Paleotropic king-dom.