Abstract: In view of the problems of traditional selection methods of mine ventilator such as long design period,low design precision,failing to save design scheme and verbose writing of selection process,a software design scheme of type selection and design system of mine ventilator was put forward and the design of basic function models,design flow and key technologies of implementation of the system were introduced.The system realizes functions such as calculation of type parameters,output of performance curve,automation calculation of operating points,automation generation of type selection report,storage and query of type selection data of mine ventilator based on the least-squares method,LONGRUAN GIS 3.0 platform and Access database.