To obtain porous medical implants with excellent mechanical properties and biocompatibility, compression performance analysis of CoCrMo alloy parts manufactured by selective laser melting (SLM) is performed. Compression experiments are conducted on the electronic universal testing machine along longitudinal direction, in which the CoCrMo alloy parts are made and fractal interpolation theory is used to analyze the influence caused by relevant parameters on compression performance. The experiment results show that the main deformation is slippage. Both of the elastic modulus and the compressive strength decrease with increasing porosity and average pore size, while decrease with the reduction of surface area to volume ratio. When the regular octahedral and regular hexahedral porous structures are with porosity in the range of 55%~84%, average pore size of 0.51~0.99 mm, and surface area to volume ratio from 2 to 4.2, the elastic modulus will meet the requirement. Regular octahedral cylindrical porous structures have better performance than the square structures, but regular hexahedral square porous structures have better performance than the cylindrical structures. The conclusions above provide important basis for selective laser melting process of porous CoCrMo alloy structures used as medical implants.