Abstract: For construction of deep extra-long tunnels with a hazard of rock burst, it is significant to take accurate measurement of the geostress for analyzing rock mass stability and rock burst potential. The principles, calculation method and application procedures of geostress measurement using a hollow inclusion stressometer are introduced in detail, especially the problems that happen often in the course of site measurement. Hole drilling and equipment installation are improved, which effectively increases measurement efficiency and avoids equipment loss. Tests and comparisons of the geostress are carried out for the surrounding rock of the Micangshan tunnel using the hollow inclusion stress relief method and the acoustic emission method, with the results showing the stress magnitude and direction measured by these two methods are very close.