Abstract: Through the establishment of a multi-class membership function model,associated influence factors weight was calculated by AHP and other method,a set of system and method of suitability evaluation model for filling mining area of coal gangue was formed.On the basis of this,relative system was developed by using C# combine with ArcEngine development kit,so the graphic processing,spatial analysis and backfill mining suitable area division evaluation of coal gangue could realized,priority order of filling suitable confirmed by actual available coal gangue total amount of mining area,output surface protection range.It provides technical support for using coal gangue reasonably and availably,mining damage protection and "undersurface of building (structure),railway,water" mining plan confirmation.

Key words: ArcEngine, Suitability Evaluation, Waste filling, Membership function, AHP