The article discusses how legal science and the legal system of society are connected. It explores how legal doctrine and law systems work together, especially in civil law families. The research looks at the influence of legal science on the development of legal systems and how it functions within them. Examples from modern and medieval legal systems are provided, showing how legal science plays a role in shaping and maintaining legal systems. Legal science has evolved over time, even in situations where legal systems have regressed. It helps maintain the integrity of legal systems and influences how laws are implemented for protection and regulation, especially in areas like criminal law.