For the design of pore structure of titanium alloy implants, most of the current researches are on regular pore structures, while few of them are concerned with the design of gradient pore structures. In this research, two methods of designing circular pores with Planar Center Gradient and Spatial Sphere Gradient are proposed. On this basis, a certain model design of Planar Center Gradient is completed, some samples of titanium alloy gradient pore and regular pore structure implants with a porosity of 75% were fabricated by Selective Laser Melting(SLM), and made microscopic material characterization. Through the test of mechanical properties, the related mechanical data are obtained. Conclusion: The mechanical properties of the gradient pore structure are better than those of regular pores. Under the condition of porosity of 75%, the average elastic modulus of gradient pore sample is 36.25% higher than that of regular pore and the average compressive strength is increased by 29.9%.