Provided in the present invention are a substituted heteroaryl compound, a composition containing same, and an application thereof, the present invention disclosing a heteroaryl compound of the formula (I), or a crystalline form, a pharmaceutically acceptable salt, a prodrug, a stereoisomer, a hydrate, or a solvent compound thereof. The substituted heteroaryl compound and the composition containing same set forth in the present invention can be used for regulating hypoxia inducible factor (HIF) and/or endogenous erythropoietin (EPO), simultaneously having better pharmacokinetic parameter characteristics and being able to improve the drug concentration of the compound in animal bodies, in order to improve the curative effect and safety of the drug.