Three-dimensional printing method

A three-dimensional printing method adapted for a three-dimensional printer, which comprises a model printing head, a color printing head, and a platform, wherein the model printing head prints a forming layer on an X-Y plane of the platform, and the model printing head and the color printing head are arranged along an X-axis and co-constructed, the three-dimensional printing method comprising:

• providing information of the forming layer and a coloring zone of the forming layer;
• driving the model printing head by a processor to print at least one material barrier outside a contour range of the forming layer on the platform according to the information of the forming layer and the coloring zone when printing the forming layer;
• and
• after completing the forming layer and the material barrier, driving the color printing head by the processor to color the coloring zone along a Y-axis, so that, while the color printing head performs coloring function, a movement of the color printing head drives the model printing head over the forming layer, the material barrier is located on a moving path of the model printing head and a related position of moving path of the color printing head, and the model printing head passes and contacts the material barrier before passing over the forming layer.