The experiments of laser direct forming W-Cu composites are conducted. The effects of W-Cu powder-mixing homogeneity and W-powder morphology on the forming quality in the laser direct forming of W-Cu composites are studied. The microstructures of forming samples are analyzed and the relative density of forming samples is measured. The study results show that the pores of forming samples are mainly caused by the agglomeration of W-powder particles, and the number of pores increases with the increase of laser power which leads to the decrease of the relative density of forming samples. By using the spherical W-powder with diameter of 54-100 μm and as a result of good fluidity, the forming sample has a relative density of larger than 99%. By using the W-powder with diameter of 25-54 μm and as a result of powder-flowing-apart during the powder-delivering process, the nonuniform distributions of W and Cu and uneven surface in the forming sample occur.