Carbon Fiber Reinforced Plastics (CFRP) has so much merits for example mechanical characteristic, light weight, and thermal resistance. For purpose of using CFRP better than better, the cutting and drilling course is necessary, and the study of optimal cutting and drilling course is appear to be very important.Generally, the CFRP needs the processes of lathe turning, drilling, milling, and cutting after molding. But on the account of some cause of these processes that as sudden abrasion of tools, heavy surface roughness and defective layer by crack and delamination. The study to inspect the conditions for the high products by minimum these cause will be necessary.In this study, we made a work-piece by Carbon Fiber Reinforced Plastics with Orientation Angle [0°/90°]. We achieve a drilling test under set conditions with TiAlN-coated drill and uncoated carbide drill. This thesis is a study of the optimum drilling machining conditions of CFRP with different conditions. Then we analyzed the tool wear, cutting force, and observed the enter/exit surface with microscope. It is shown that the tool wear is increased following cutting velocity and feed as expected. But the thrust and torque is decreasing when rpm is faster. And the feed is not so important to the tool wear and cutting force. Then, we focus on the coat in the test it is shown the coated drill is less than the uncoated drill. So the coating is meaningless in the CFRP drilling by carbide material drill. Finally, we implemented a comparative experiment used the 90o point angle carbide drill which we design and build as the result of first phase by carbide drill and TiAlN-coated drill. In the second phase of the experiment what used the 90o point angle carbide drill we test the cutting force, the tool wear and implemented the enter/exit surface in the fast feed rate and all rpm. Because the feed rate is not so great influence to cutting force and tool wear. At last we got some ideal result what is reamer shows the best characteristic whatever the thrust or the tool life even the enter/exit surface.