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This paper presents a distributed intelligent LED illumination dimmer system based on wireless communication technology, which can meet the needs of the modern intelligent building and networking-based light source control applications. The system consists of MSP430 microprocessor-based digital control terminals and PC-based host computer. According to the reference parameters of LED illumination and turn-on time saved inside the microprocessor, the digital control terminals carry out closed-loop PWM control algorithm to realize illumination adjustment of distributed LED light sources. By using wireless communication method, the host computer can control remote distributed LED terminals to execute several operations, including switching manipulation, reference parameters update, illumination condition monitoring. Test experimental results indicate that the proposed illumination dimmer system works reliably, and achieves required functions. 