Abstract: Recently, the indoor visible light wireless communications technology is emerged companied with the blooming white light-emitting diode (LED) lighting technology. In this thesis, the current visible light communication system was analyzed and aiming at the request of application in indoor visible light communication system, an avalanche photodiode (APD) detecting circuit was designed. Firstly, the work principle of the APD detecting circuit was described. Secondly, a detailed design and analysis of the system structure and their function of the circuit components was presented. Finally, a detecting circuit component of the indoor visible light wireless communications receivers was designed, and related experiment tests were tested. Experimental results show that the design is effective and feasible, the APD detecting circuit has high gain, wide bandwidth, stable temperature control and high stability etc, therefore the detecting circuit is capable of meeting the needs of indoor visible light communication systems, provides a basis for further study on indoor visible light communication systems.