Abstract: Grain safety research is important for the development of an area.Since the seventies of last century,related researches have been made by the specialists in different domains of science both at home and abroad,from different points of view and with case studies in some regions.In this paper,the grain safety was analyzed from the aspects of quantity,quality and sustainable development,and a case study was made in the Baota District of Yan’an,a hilly and gully area of the Loess Plateau.The results showed that the grain production of this District could not fully meet the welltodo requirement 400 kg per capita,especially under the conditions of increasing cultivated area run-off and grain-dependent animals breeding,which made the grain safety more important.As for grain quality,this district was relatively safe because of less harmful substance in grain.But,due to the fact that it is in the suburb of Yan’an,this district is under greater pressure of limited cultivated land,and thus,it is essential to improve its land-use structure,promote science and technology level,or purchase grain from other places to meet local demands.

Key words: Entomogenous fungi, Community, Biodiversity