The present disclosure relates to a salt of phenyl pyrimidinone compound, a polymorph thereof and a pharmaceutical composition comprising the same and a use thereof, particularly relates to the hydrochlorate of phenyl pyrimidinone compound of following formula (I-A) and a pharmaceutically acceptable polymorph, solvate, hydrate, co-crystal, anhydrous substance, or amorphous form thereof, a pharmaceutical composition and a pharmaceutical unit dosage comprising the same, the preparing method and use thereof.