The development and application of high-wet sludge/ biomass resource technology are recently promoted in China under thebackdrop of the dual carbon target. Chemical looping technology, as an emerging method for energy utilization, has been widely applied inthe treatment of organic solid waste. The research status of the commonly used disposal technologies of high-wet sludge and agroforestrywaste and chemical looping gasification were summarized. The research progress on the influence of ash and moisture on gasification characteristics during chemical looping gasification process was emphasized and summarized. The oxygen carrier, as a crucial component inchemical looping technology, has been achieved abundant research results. Iron-based oxygen carrier is one of the most concerned oxygencarriers among various oxygen carriers in chemical looping gasification because of their low cost and high oxygen-carrying capacity. However, its reaction activity is relatively low, which needs to be modified by doping Ni, Ca, K and other elements. The ash and moisture inthe sludge have bidirectional effects on the gasification products and gasification efficiency, and even affect the NOx emission. The oxygencarrier activity can be improveddue to the K and Ca oxides contained in sludge/ biomass ash, but the increase of reaction rate will lead tolocal sintering of oxygen carrier, thereby reducing the oxygen carrier activity. The circulating ash is in full contact with the gas phase,which has a certain catalytic effect on gas reforming, thus improving the quality of syngas. Although the release of moisture from sludge/ biomass absorbs a large amount of heat into vapor, a moderate amount of water vapor and oxygen carrier co-participate in the reaction of carbon conversion into syngas of rich H2, which promotes the quality of hydrogen-rich gas. When water vapor is excessively supplied as agasification agent, CO2 production increases greatly and the syngas quality is reduced. Therefore, the positive effects of ash and moistureshould be used to improve the gasification efficiency of high wet sludge and biomass in the process of chemical looping gasification, inwhich the control of circulating ash amount and moisture release rate is the key way.