object model 3 u2032 is corresponding to the hot meltable board 4 a the hot meltable board 4 b and the hot meltable board 4 z respectively each sectional surfaces 2 a 2 b 2 z are corresponding to each outlines 22 a 22 b 22 z which are enclosed to form a first area a second area a zth area on the hot meltable boards 4 a 4 b 4 z respectively the enclosed first area the enclosed second area the enclosed zth area are heated and melted to form a spaces 40 a 40 b 40 z so as to the forming liquids 42 a 42 b 42 z are filled into the spaces 40 a 40 b 40 z respectively step 708 the stacked hot meltable boards is heated to melt by the forming device 16 and the forming liquids 42 a 42 b 42 z are solidified then please refer to fig1 fig5 and fig7 fig7 is a flow diagram of the rapid prototyping method of the second embodiment in accordance with the present invention according to above rapid prototyping system 1 the present invention provides a rapid prototyping method as shown in fig7 the rapid prototyping method includes the steps of following step 801 an object model 3.