Abstract: Ground stress measurements and study in western China become more and more important with increasing construction investment in recent years.Hydraulic fracturing in-situ stress measurements were carried out in a working area of a mountain tunnel(with a maximum burial depth of 1100 m) in the North Tianshan Mountains along the proposed Jing-Yi-Huo Railway in western Xinjiang,and the values and directions of the principal stresses in the stress field in the North Tianshan region were obtained.According to the results of the stress measurements,the authors have studied the stress state in the stress field of the working area and analyzed the stability of the surrounding rocks of the tunnel and the possibility of the occurrence of geological hazards.