Abstract: Gradient function design thought is introduced in structure and material design of functionally gradient concrete segment(FGCS). Owing to blending a shrinkage reducing ingredient that can decrease shrinkage, and an anti cracking ingredient that can fine cracks in mesointerfacial transition zonefree cement based materials(MIF), the shrinkage of MIF is decreased, and the ability to anti cracking is improved. Because of the above mentioned cause, the impermeability of MIF and FGCS can be improved. When the concrete is cast twice, interface bond strength between two functional layers is increased by 10% to 35% by means of imprinting process as compared to the control without imprinting process. Imprinting process can result in the effect of interface strengthening. The maximum interface tensile stress due to shrinkage in interface is calculated by ANSYS software (finite element analysis tool), whose value is less than the test value of interface splitting tensile strength. Interface tensile stress due to shrinkage in interface doesn’t result in cracking of FGCS, and the sliding deformation of interface layers would not generate. FGCS has been used in Wuhan Yangtze River Tunnel Engineering, whose width of crack is less than 0.1 mm on the outside arc surface, and whose chloride diffusion coefficient is 4.9×10^-13m²/s.