Based on FUS series fermentation tank, we developed reactor for contrastive fermentation experiments. It adopts high reliable bus control system to control and display data during the experiment. As compared to FUS series fermentation tank, it has the following meritsIntegration of independent tank layout and compact machine structureConvenient touch screen computerControl diffusion and centralized display High reliability and expandabilityOther optional configurations: our variable-speed peristaltic pumps for acid dosing (alkali dosing), bubble removing agent, auto feeding