Based on the study of the mix proportion of DSP(Densified Containing homogeneously arranged ultrafine Particles)for the sake of rock anchor grouting, the effects of water-binder ratio, volume of nanometer silica and different curing methods on the mechanical behaviors of the grouts have been investigated. A serial of appropriate proportion of DSP grout with good working performance were successfully found. The 48 h compressive strength in （80±2） ℃ hot water curing reached 127 MPa, the 7 d and 28 d compressive strength in standard curing reached 99 MPa and 120 MPa respectively, and the 7 d and 28 d compressive strength in underground natural cave curing reached 81 MPa and 109 MPa respectively.