Abstract: Based on a geomechanical analysis of the regional tectonic stress filed in combination with a in laboratory measuring of the geostress occuring at the oriented marble samples drilled out at the trial adit of the diversion tunnel proposed, this paper has made a preliminary study of geostress filed in the site, compared a relation of geomechanical macro analysis to geostress measuring results, and approached some problems with respect to geostress measuring by acoustic emission (AE) mdthod。