Abstract: To study the effects of sand content on dynamic compression strength and energy absorption characteristics of cemented silty clay, dynamic compression tests on cemented silty clay with different sand contents were conducted using Φ 50 mm split Hopkinson pressure bar (SHPB) apparatus under 0.4 MPa impact pressure. The results show that the dynamic stress-strain curve of plain cemented silty clay (without sand) can be divided into three stages of elastic deformation, yield-hardening and failure. With the increase of sand content, there is an ideal plastic stage occurring on dynamic stress-strain curve but not obvious for yield stage gradually. In addition, the dynamic compression strength of silty clay stabilized by cement mortar increases firstly and then decreases with the increasing of sand content. The maximum of dynamic compression strength of silty clay stabilized by cement mortar is 9.56 MPa at sand content of 10%, which results in 9.79% increase compared with plain cement-soil. The absorbed energy of silty clay stabilized by cement mortar increases with the increase of dynamic compression strength, which shows an approximate exponential relation.