Abstract: With the rapid economy development and the improvement of people's material living standard in China,there are more and more living and industrial waste. The fouling and slagging problems of incinerators caused by the characteristics of domestic garbage seriously affect the continuous incinerator operation,thermal efficiency and power generation. Therefore,it is necessary to study the fouling and slag-/h circulating fluidized bed incineration were studied. Through the field investigation and sampling,fuel and fly ash composition and chemical analysis and theoretical calculations,the amount of combustibles in air preheater could be determined. Then,the main reasons for high and low temperature ash deposition were further studied. Finally,the control measures of fuel adjustment,boiler operation and equipment transformation were put forward. When the preheater begins to reburn,there are at least about 3 t combustibles in the entire air preheater and at the same time the fouling ash has reduced the half inner diameter of the central tube of separator.The multi waste fuel is hard to burnout completely due to its higher particle size and lower density. According to the TGA test,it can be seen that the decomposition rate is much slower below 300 ℃. It is easy to form the tar organics due to the unburned fuel during cooling process and the viscosity of the organic matter in the low temperature ambient is the main reasons for the ash low temperature fouling in the air preheater. Meanwhile,the low temperature eutectic formed between the alkali and alkaline earth metals(Na,K,Ca,etc.) and Cl,S,O is the main cause of ash slagging in the central tube. In addition,the speed variation and secondary reflow produced by the stiffener of the central tube will increase the possibility of particles hitting the tube surface,which is likely to be one of the key factors to induce slagging at the initial stage. According to the above two problems a series of control strategies based on fuel adjustment,boiler operation and equipment modification are proposed.It mainly includes:improving the waste fuel feeding system,strengthening steam soot-blower,adding pulse soot-blowers and inert gas protection system in the air preheater,controlling the blending ratio of waste fuel,adjusting the temperature of the separator,increasing the flue gas flow rate,adding MgO,Fe2 O3 powder or kaolin;a good mix of air and fuel can avoid the formation of a reducing atmosphere at the fouling and slagging location.