Only under the condition of market economy can property rights be different from the traditional ownership and become the organic right constraint with rich connotation, and be different from the hierarchical privilege in feudal times and become the equal legal right. Only by establishing and maintaining an effectiveproperty right system can market economy realize rational and effective allocation of resources. Under the condition of market economy, property right cannot leave the protection of law. From the perspective of law, law has inherent and essential requirements on property rights.