According to FCC（catalytic cracking）gasoline desulfurization, a set of test device was designed. The working principle of the experimental device and the selection of the key equipment were introduced in the article. It would effectively reduced the pulsation and solved the low metering accuracy of the pump, and the mixing time of the static mixer was too short and resulted in undermixing, and heat loss was too much and so on. From a longterm perspective, the design of desulfurization device provided a new way and making up for the deficiency of the existing desulfurization device.