Polymorphs of (S)-2-(1-(9H-purin-6-ylamino)propyl)-5-fluoro-3-phenylquinazolin-4(3H)-one, compositions thereof, methods for their preparation, and methods for their use are disclosed.本發明揭示(S)-2-(1-(9H-嘌呤-6-基胺基)丙基)-5-氟-3-苯基喹唑啉-4(3H)-酮的多晶型、其組成物、其製備方法及其使用方法。