Abstract: Biomass has great potential as a low-cost,abundant and green energy source.However,due to the high content of the alkali metal contained in biomass,there are some serious problems such as alkali slagging,ash fusion,agglomeration and corrosion during the biomass utilization process.Among those,the slagging exists in the whole process of biomass utilization and leads to the formation and growth of the agglomerates and sediments,which is extremely difficult to deal with and can bring about great harm to the boiler operation.Therefore,slagresistant biomass fuel preparation is a feasible means to achieve efficient utilization of biomass fuel.At present,in order to solve the slagging problem in the process of biomass heat conversion and utilization,the generation and conversion processes of alkali metal chlorides,sulfates,and silicates are changed by the different methods such as additives addition,co-firing,chemical pretreatment,and alloying.Among those,the high-ash-fusion-point biomass with good anti-slagging function can be produced by the mixing of additives with biomass.Here,in this paper,the existence form of alkali contained in biomass,the releasing way and the migration behavior of potassium in the process of heat conversion were introduced.Then,the mechanism of the slagging occurring during the thermal conversion of the biomas were summarized.Subsequently,the anti-slagging mechanism of the three additives including aluminum-based,calcium-based,and phosphorus-based materials during the heat conversion process of the biomass were analyzed. In general,the use of three additives have better anti-slagging performance.Among those,the phosphorus-based additive can do with the slagging occurring in the flue system and the furnace bottom of the biomass boiler.The calcium-based material can only solve the slagging occurring in the furnace bottom,but results in more serious slagging occurring in the flue system.Although the aluminum-based material can achieve similar results with that of the phosphorus-based additive,its cost is high and the performance weakens with increasing temperature.The future research of the anti-slagging biomass fuels should focus on the new additives,such as single compounds or mixed mineral additives,which can fix potassium from flue gas and react with the bottom silicate to form high ash fusion point substance.Moreover,the molding process of the biomass mixed with additives should be paid more attention to and the slag-resistant biomass briquette with high mechanical strength should be developed.Laboratory of clean carbon-based fuel conversion,USST has been engaged in the research on the high-strength slag-resistant biomass briquetteand the biomass briquette fuel with good strength and anti-slagging performance has been developed. The paper can provide some references for the research and development of the anti-slagging biomass briquette.