The Selective Laser Melting (SLM) technology was utilized to fabricate high-strength TiB2/AlSi10Mg alloy. The effects of laser energy density E on the relative density, microstructure of the as-fabricated samples were researched by means of Optical Microscope(OM) and Scan Electron Microscope (SEM). The microhardness and tensile properties of the samples at different parameters were also investigated and the effects of various heat treatment(HT) condition on tensile properties of the SLM processed TiB2/AlSi10Mg were revealed. The results showed that the relative density of the sample improved and defects decreased with the increase of E. When E was increased to 71.5 J/mm3, there was only a few defects on sample section, and the clusters of TiB2 particles disappeared with a uniform distribution. Under this laser processing condition, the microhardness on the cross section reached to 138.9 HV0.5. Due to the addition of the TiB2 particle, the tensile property of the SLM-processed TiB2/AlSi10Mg alloy realized a tensile strength of 420 MPa and elongation of 6.13%, showing a 13.5% and 50% increcement respectively compared with the SLM-processed pure AlSi10Mg alloy. The temperature and time of HT also influenced the property of the TiB2/AlSi10Mg alloy and in this research, the relative optimized HT temperature and time were T=170 ℃, t=10 h, respectively.