Answer : 3D kitchen design can be done with some simple software like Google Sketchup.
First, you'll need to measure the dimensions of your kitchen and draw it out on a piece of paper. Next, you can use basic shapes like rectangles, squares, and circles to represent your cabinets, appliances, counters, and so on. Once everything is roughly in place, start playing around with the sizes and shapes until you have a design that you like.
If you're not comfortable drawing by hand, there are also a number of 3D software programs that can help you create a realistic rendering of your kitchen. Just be sure to check the program's requirements beforehand to make sure that it will work with your computer's hardware.