Research conclusions:(1)The mechanical properties of CA mortar is affected obviously by strain rates.(2)The compressive strength，elastic modulus and peak strain will increase with the strain rates，and compressive strength of CA mortar is the most sensitive to the strain rate，and it can improve 2. 5 times with the strain rate ranging from 10-5s~10-2s-1.(3)The fundamental shapes of the stress-strain curves of CA mortar at different strain rates are similar to each other，a rational fraction of expression is proposed here to express the stress-stain relationship of CA mortar at different rates. (4)The comparison between theoretical and experimental results shows a very good agreement at different rates，the research results could provide experimental evidence for establishing the rate type constitutive model，and apply to the design of dynamic structures of slab track.