This study mainly focused on investigating the feasibility of fermentation liquor from rice straw for bioflocculant production during an aerobic fermentation process.The pH increased dramatically from 8.1 to 9.1 after 30 days of operation, and maintained variation between 8.8 and 9.3.A compound bioflocculant producing inoculums was inoculated into compound media in which fermentation liquor and conventional bioflocculants medium at different ratios.