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Chitin is an abundant natural nitrogen-containing biopolymer with great application potential in materials,environment,energy,and health.However,the structure characteristics and processing technologies have required intense research in related applications.In particular,there have been great efforts to developing solvents for chitin,and the results so far are quite encouraging.This review summarizes the main solvent systems used for chitin,namely the aqueous solvent systems (mineral acids,inorganic salt aqueous solutions,alkali aqueous solutions)and non-aqueous ones (LiCl-dimethylacetamide solvents,CaCl2·2H2O saturated methanol,ionic liquids,deep eutectic solvents,and protic organic solvents).The solvent properties,dissolution methods,and solution properties are discussed in detail.Special attention is paid to the dissolution mechanism in each system.This review can provide a reference for understanding the dissolution behavior of chitin and finding suitable solvents for it.