Study is made on large deformation of soft rock tunnel with high ground stress located in thin bedded carbonaceous mudstone interbedded sandstone in Northeast China in terms of bench height and length, construction technologies and construction organization. Some conclusions are drawn as follows: 1) The height of top heading is 3.5 m; and singlelayer Hsteel I25b, 89 mm pipe roof, longitudinal shaped steel and radial grouting are adopted. 2) The construction principle of rapid excavation, rapid support, rapid close and invert lining timely is adopted. Finally, the deformation of surrounding rocks has been brought under effective control; the construction safety has been guaranteed and the construction schedule has been shortened.