The present invention provides a crystalline form of the heterocyclic compound represented by formula A or a hydrate thereof, and preparation method and application thereof. The crystalline form of the compound of formula A or hydrate thereof is superior to its amorphous form in terms of solubility, hygroscopicity, and stability. Furthermore, the crystalline form also has better bioavailability than the amorphous form. In addition, its preparation method is simple, and therefore it has a higher practicality.
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