Roof-contacted filling of mined-out area has considerable influence on safety and production of mine in witch filling mining method is used.In Caolou Iron Mine,a new roof-contacted filling technics was developed according to the concrete conditions.This technics have a slight increasing working procedure contrast to conventional technics,but the rate of roof-contacted can be very increased,resulting in good effect in practical production.It provide a strong technical support for the later mining and filling in the mine and a reference to similar mine.