Chu Mom Ray national park (NP), Sa Thay district, Kon Tum province is an importance place in a junction of Ho Chi Minh trail system in American war in Vietnam, which had been spray dioxin toxic during the years from 1965 to 1970. The landscape ecology of Chu Mom Ray NP are belong to 4 subclass, 12 types. They located in Topical monsoon System of Vietnam, Subsystem of Topical monsoon in Tay Nguyen Highland. Belong to Low Mountain class in Tay Nguyen highland, included 3 subclass and I subclass of man-made. The landscape ecology type VI, IX and VII, X have been impacted by dioxin, especially type VII and X have more stronger impacted. The changing of area showed the type I, IV, VIII have been lightly changed (about 2000ha), type V, IX changed about 5000 ha. The area of type II, III, VII are decreased. Type II is decreased about 5400 ha
type III is about 16000 ha, and type VIII is about 6000 ha. The area of type VI is increased over 13000 ha and type X is over 8500 ha. The long impaction of the Dioxin toxic is destroys the form, the structure of landscape ecology. The type of III and VII are covered by poor vegetation. The biodiversity and diversity index of the impacted type are lower than non-impacted types.