The (TiB+TiC) dual reinforced TC4 composite was in-situ fabricated via incorporating 0.5 wt.% B4C reinforcement during the laser melting deposition process. The microstructure, mechanical and corrosion properties of B4C/TC4 composite were regulated by different heat treatments of annealing and solid solution. With an increasing temperature from 500 oC to 800 oC, partial lamellar α-Ti in the as-deposited sample gradually transformed into equiaxed α-Ti, accompanied by the disappearance of basketweave microstructure. At 1100 oC, a small portion of TiC phase underwent fusion. This composite exhibited the best combination of strength and plasticity after annealing at 500 oC for 4 h followed by furnace cooling, which was attributed to the stress relief effect and a refined basketweave microstructure. However, this composite experienced a decline in corrosion resistance after various heat treatments owing to the effect of grain coarsening and micro-galvanic corrosion.