Abstract: The pneumatic ratchet soot blower and the structure and control principle of CKQ-Ⅱ controller as well as its application in heat medium heater are introduced. The pneumatic ratchet soot blower has got many advantages, such as high level automation control (unattended), soot blower integrated with controller, stable control process, high efficiency and easier to repair compared with conventional soot blower. This soot blower can be adopted in heater and boiler.