Abstract: In the period from 1975—1976,the author made pathological and fungal investigations in forest in a region located below an altilude of 5,000 meters in Tibet,where a complete and comprehensive spectum of perpendicularly distributed forest was seen. Here is provided a very rare natural laboratory in the world,in which there exist very good conditions for the study of the ecological aspect of the rust.After a preliminary study the rust flora investigated contains 20 genera and we nomiate it the China-Himalayas rust flora. This rust flora is classified into 3 types in according to conditions of water and temperture:1) the plateau type.2) the temperate zone type.3) the sub-tropical zone type.Each type may be charaterized by any species belonging to it.The analysis that has been made shows that the region investigated has the following features:It is a place of origin for a new rust type,the rust flora in this region has affinities to those in other regions,thus it is possible for this rust flora to constitut a potential source of forest disease.