Abstract: The Longshou II hydropower project is a steel concrete face slab rock- filled damwith a maximal height of 146.5 m. It is located in high rate earthquake area and the valley is dissymmetrical whose width- to- height ratio is 1:1.3. The climate here is extremely cold and dry, with a wide range of temperature variation between day and night. Because of special topographical condition, the face slab undergoes tensile pressure that higher designing requirement of crack resistance of face slab is put forward. According to the particularity of this project, the aspects such as dam type, construction parameters selection of dam material and design for different damblocks were researched and relative measures were taken to reduce cracks. For some face slab, concrete mixed with steel reinforcing bar and steel fibre were adopted (the vertical steel reinforcement ratio was 0.4%, the lateral steel reinforcement ratio was 0.35% and the fibre dosage of Dramix RC- 80 /60- BN steel was 35 kg/m3). In the second stage, besides steel fibre, polypropylene fibre concrete was adopted (the vertical steel reinforcement ratio was 0.4%, the lateral steel reinforcement ratio was 0.35% and the fibre dosage of polypropylene is 1 kg/m3)in construction to control cracks on face slab.