To obtain good fusion and precision of drops during drop deposition increasing material manufacturing,the drop deformation and solidification after impinging on the substrate was simulated.Two phase flow model,combining with free surface tracking algorithm and solidification interface tracking algorithm,was adapted to built up the coupled calculating models for drop deformation and solidification.The results show that the temperature transformation of the drop agrees well with the shape deformation,and the part contacting with the substrate solidifies instantaneously as the drop impinges on the substrate.The solidification layer radius equals to the drop radius,and the effect of the impinging velocity on solidification is more than that of the temperature.A concept of semi-solidification was proposed,and the time,radius and thickness of frozen layer for semi-solidification drop were calcutlated.The fusion was in the good conditon when the former drop was in semi-solidification state.