Disclosed are a salt and a polymorph of a benzopyrimidinone compound and a pharmaceutical composition and the use thereof. In particular, disclosed are a hydrochloride of a benzopyrimidinone compound as shown in the following formula, (I-A), a pharmaceutically acceptable polymorph, solvate, hydrate, co-crystal, anhydride or amorphous form thereof, a pharmaceutical composition and drug unit dosage form containing same, a method for preparing the above-mentioned substances and the use thereof.