Abstract: Disclosed in the present invention are polymorphic forms of a compound and a preparation method therefor and an application thereof. A crystal form III of a compound A uses Cu—K? radiation, and X-ray powder diffraction expressed at 2? angles has characteristic peaks at 12.15±0.20°, 15.98±0.20°, 16.62±0.20°, 17.14±0.20°, 24.32±0.20°, and 26.08±0.20°. A crystal form VII of the compound A uses Cu—K? radiation, and X-ray powder diffraction expressed at 2? angles has characteristic peaks at 12.94±0.20°, 14.41±0.20°, 15.64±0.20°, 17.25±0.20°, 21.75±0.20°, and 24.23±0.20°. The polymorphic forms prepared by the present invention are good in stability, and can be stably stored under the conditions of high temperature and low relative humidity.

Abstract: A one-pot method is used to prepare a fused pyrazole-type compound substituted at nitrogen on 2-position, specifically an indazole-type compound substituted at nitrogen on 2-position. In the method, after azidizing a halogen in a substrate, without post-processing, R-NH2 can be directly added to proceed a ring-closing reaction with an aldehyde group, so as to give the fused pyrazole-type compound substituted at nitrogen on 2-position. For example, by using 2-fluoro-4 methoxy-5-nitro benzaldehyde as a raw material, the indazole-type compound substituted at nitrogen on 2-position can be obtained via azidation and ring-closing steps, and then a series of indazole derivatives can be produced by means of a hydrogenation reaction and a condensation reaction.