Abstract: Maize is the third largest food, whose variety safety is closely related to the food security. At present, the Hexi seed production base is facing several problems including more close varieties, less distant varieties, germplasm resources homogenization and so on. Based on the related research of maize variety safety, combined with field survey data, we used the AHP-fuzzy comprehensive evaluation method. From the four aspects of resource security, market security, management security and technology security, 24 indexes were selected to construct the evaluation system for the safety system of maize varieties; and the obstacle factors on the maize safety were investigated. The results showed that the safety of maize varieties in a state of insecurity, which was mainly due to the insecurity of core production link. The degree of obstacle factors for the safety of maize varieties showed in the order of technical factor>market factor>resource factor>management factor. In the single obstacle factor evaluation, the perfection of supervision and management system for seed market, Improper competition in seed markets, perfection, technical standard of seed production, management level of seed production process became the main factors affecting the safety of maize varieties.

Key words: maize variety safety, fuzzy comprehensive evaluation, market factor, technical factor, obstacle factor