Additive manufacturing(3D printing), as an advanced forming method, has natural advantages in the manufacture of complex porous structures. In order to study the process-performance rules of 3D printing formed porous structure,In this paper,the porous structure is formed based on the Ti-6Al-4V alloy (TC4) material and the 3D printing method of selective laser melting (SLM), through orthogonal experimental design, the SLM selective laser melting process parameters including laser power, scanning speed, and lap distance were selected as the experimental factors, and the range and variance analysis were used to study the effects of different process factors on metal selective laser melting (SLM) 3D printing. The influence law of mechanical properties of porous samples and the degree of influence of related factors on different performance indexes. Finally, the linear regression equation relationship between relevant factors and performance indicators is obtained by using the linear regression equation fitting method, and the theoretical performance value of the optimal performance combination is predicted through the regression relationship equation and compared with the actual test value. The theoretical value and the actual value have the good correspondence proves the feasibility and accuracy of establishing the functional mapping relationship between factor conditions and performance for predicting the performance of SLM-formed porous structures by means of orthogonal experiments