Abstract: High temperature is an important factor affecting the distribution of cold-season turf grass. It is difficult to plant cold-season turf grass in the South of China because of high temperature in summer.Spraying multiple-effect triazole (MET) with 0 - 1 000 mg·kg^-1 to tall fescue turf grass indicates that application of 200 mg·kg^-1 MET can inhibit the top growth of the turf grass, promote accumulation of the underground biomass and imp rove turf quality. It can also increase contents of chlorophylls, soluble sugar and soluble protein of leaves and peroxidase activity, decrease malonaldehyde content, maintain stability ofmembrane system of leaves, with more heat tolerance,anti-disease capacity, and oversummering ability.

Key words: Multiple-effect triazole, Tall fescue, Turf grass, Heat tolerance