Abstract: With the proposal of China's dual-carbon strategy, the development and utilization of new energy is increasing day by day, and thermal power units need to operate flexibly according to the situation of new energy power generation, and the circulating fluidized bed (CFB) unit has become an important carrier for the deep peaking of coal-fired units by virtue of its good fuel adaptability and variable load potential. Aiming at the hydrodynamic safety problems in the deep peaking process of circulating fluidized bed boilers, a systematic summary is made from four aspects, namely, the application of water-cooled wall internal threaded pipe, optimization of the water-cooled wall system structure, management of water-cooled wall temperature difference, and low load turn-around operation of the unit, and combined with the case of the unit. The results show that: the application of internal threaded pipe can help to improve heat transfer deterioration, and under deep peaking conditions, it is necessary to find a balance between the reduction of mass flow rate for deep peaking and the increase of mass flow rate for delayed heat transfer deterioration, maximize the ability of internal threaded pipe to improve the heat 收稿日期： 基金项目: 怀柔实验室项目ZD2023008A。 作者简介（通讯作者）:徐东海(1984－),男,安徽省宿州市,教授,博士。E-mail: xudonghai@xjtu.edu.cn。 transfer of the flow, and develop water-cooled wall pipe types more adaptable to peaking has become an important direction of future research; the secondary rise water-cooled wall system can effectively alleviate the deep peaking of CFB boilers. The secondary rising water-cooled wall system can effectively alleviate the water-cooled wall safety problem under the low load condition of CFB boiler, but we need to pay attention to the wall temperature deviation of the heated surface of the water-cooled screen, and adjust the flow distribution of the water-cooled screen. Improve the wall temperature deviation of the water system at low load; optimize the economy and pump loss during wet operation can effectively solve the low-load hydrodynamic safety problem and further reduce the target load of deep shifting, which is of great significance for CFB units to participate in deep peaking. Existing units are mainly modified in terms of combustion intensity control and hydrodynamic system structure optimization to ensure the safe and stable operation of hydrodynamic system, and the flow heat transfer characteristics and adaptability of internal threaded pipe under ultra-supercritical conditions can be investigated for ultra-supercritical units to cope with the demand of deep peaking.