STEP 1.Start by drawing out the circle for his head and then add the facial guidelines. Draw a neck line and then another circle for his torso. From the torso shape add the limb lines for his arms and legs.
STEP 2.Now that the guidelines are drawn out you can start drawing the crazy style of his famous hair. Next, draw the jaw and chin shape along with his child like ears. Start sketching out his shirt of his training outfit and then the inner lower legs. Lastly draw out the shape of his feet.
STEP 3.Son Goku is pretty easy to draw all you have to do here is add the shape of his big friendly eyes and then finish the lining for his clothes as seen here. You will now need to draw out his arms and then add the detailing on the shoes and the shape of his wrist bands.
STEP 4.Wow, look how awesome kid Goku is coming out! The next thing you will do is draw out the remaining spiky line shapes for his hair and then add detail to his chest. Detail and define his training suit which includes the belt and all. Add crease lines to his wrist bands and then add wrinkle lines to the bottom of his pants.
STEP 5.Your last step. All you have to do is first erase all the guidelines and shapes that you drew in step one. Add detail inside of his ears and a bit more detail to his clothes.
STEP 6.Once you are done you should end up with a drawing like the one you see here. All you have to do now is color him in and you have just completed this tutorial on "how to draw kid Goku" from Dragonball Z step by step.
source : http://www.dragoart.com