In order to satisfy the demand of secure communication, a scheme of dual-channel chaos communication based on three semiconductor ring lasers(SRL)is proposed. The time series, autocorrelation diagrams and eye diagrams under different conditions are given through numerical simulation, and the influence of transmission distance on communication quality is also discussed. The research show that the quality of chaos signal is poor for the drive SRL(D-SRL) subjected to self-feedback, after introducing mutualfeedback, the quality of chaos is significantly improved. As the transmission distance increases, the quality factor to quantify the quality of secure communication gradually decreases, but when the distance increases to 130 km, the quality factor remains above six. This scheme enables long-distance dual-channel secure communication.