Abstract: Uniaxial compression tests on curtain block of different moisture content which made of sand and gravel that taken from the east slope of Yanshan iron ore were carried out using RLW-3000 servo press testing system.And the acoustic emission (AE) activities were monitored by PCI-II AE system during the whole experimental process.According to the AE location and the AE hit count rate，the fissure space evolution regular of curtain block with different stress stage is analyzed.The experimental results indicate that the curtain body of AE event in space positioning block is divided into two areas.In the initial loading stage of the curtain body，the AE location is located in the interior of the curtain block where the position of stress concentration.With the load increasing，the AE event gradually spreads outwards from the center of each area.Because of the propagation of AE wave affected by water，so that the number of AE events of curtain body in curing condition are the most，and the number of AE events of curtain body in dry condition at least.With the increase of moisture content，AE hit count rate peak emerged earlier.The research results of the research on the rupture and instability mechanism of curtain grouting have certain significance，and also provide a theoretical basis for the stability of engineering rock mass.

Key words: Acoustic emission, Hit count rate, Curtain body, Spatial orientation, Fracture evolution