In order to make the visible light parallel communication system that is based upon LED arrays more perfect, and explore a suitable modulation technology, some experiments have been conducted and some conclusions are gotten. According to the feature of the visible light parallel communication system and quick response two dimensional (QR 2D) bar code, QR code is used as the information transmit mode of the visible light parallel communication system, and then the modulation scheme of the visible light parallel communication system is studied that is based upon 2D-bar code and the decoded techniques of QR code which is transmitted from the LED arrays. The experimental results demonstrate that QR code images can be transmitted dynamically, received expediently and decoded exactly by the way of the image processing.