Abstract: Study on the stability of biological products are different from other drugs due to their complex and changeable characteristics and highly sensitive to light, temperature, and other influencing factors. On the premise of meeting the stability requirements of common drugs, more attention should be paid to the factors affecting its quality. The stability research of biological products should pay attention to the factors affecting their quality and expiration date. It is advisable to develop a plan suitable for its product stability inspection and implement it effectively to control risks based on its product characteristics, structural characteristics, and quality standards. This article analyzes factors and common defects in stability research of biological products, providing references and guidance for stability research.