Abstract: The multi-functional wireless optical mouse uses two image photography chips to realize cursor movement through the track ball rolling and the mouse base moving. First, we compared the percentages of luminous flux received by the two image photography chips in the original mouse optical path and the chip ADNS7530 which had smaller flux was remained only. Second, keeping the light path of track ball unchanged, we added a LED which had the same optical path as the track ball source in the mouse base optical path. After the desktop reflected light of mouse base was reflected through the track ball, prism and plane mirror respectively, we compared the flux percentages eventually reaching to the image photography chip. Finally, the design that the mouse base optical path was changed by the plane mirror was verified and the wireless air mouse using one image photography chip to operate both the track ball light path and the mouse base light path was achieved.