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In the present paper, the microstructure and mechanical properties of as-deposited and duplex-annealing treated laser solid formed (LSF) Ti60 alloy at room temperature and 600 oC were investigated. It was found that Ti60 alloy is inclined to form equiaxed grains during laser solid forming due to a high proportion of the equiaxed grains in the molten pool and uncompletely remelting when new layer was deposited on prior layer. For the as-deposited sample, the microstructure is composed of Widmanst?tten α laths in prior equiaxed β grain. Through duplex-annealing treatment, the continuous prior β boundary was broken up, the α laths have an obvious tendency to coarsen and part of them were spheroidized. The ultimate tensile strength of the as-deposited LSF sample at room temperature and 600 oC are both higher than wrought, while the plasticity of room temperature is lower than wrought. The fractography shows toughness fracture character, and the plasticity of 600 oC approach those of wrought. The comprehensive mechanical properties of laser formed samples are improved obviously through duplex-annealing treatment.