he spatial and trophic niches of Phrynocephalus przewalskii ,Eremias multiocellata andEreimas vermiculata were investigated and studied in Minqin desert of Gansu from ApriI toOctober 1989 and in July and August 1990,in order to reveal coexistent mechanism of lizardspecies in the same desert communities. The spatial niche was divided into two dimensions,including ground temperature aiid vegetation coverage,The trophic niche was also dividedinto two dimensions of food kinds and diet sizes. P. przewalskii occ...