Abstract：With the exploitation of the coal resources，many engineering cases show that residual movement distortion in mined-out area would destroy the buildings on the top of the area. Combined with the characteristics of the mined-out area under Lishi—Jundu highway in Shanxi Province，the grouting in mined-out areas，drilling data and the related relationship between the mined-out area span，time，and residual subsidence are put forward；and the distortion anticipation methods and corresponding formulas are also presented. What is more，the grouting volume in the treatment mined-out area is analyzed. The related laws between the mined-out area span，time，and residual subsidence are gained. The effects of treatment mined-out area can be analyzed and estimated by calculating equivalent height of unfilled space of mined-out area and equivalent height of grouting volume.
