Abstract: Preemption right system is a traditioal system in civil laws and is still agreed on by many countries.This article studies the history of the system's development,analyzes the functions of preemption right and reveals the immediate significance of the system in society of market economy.According to the practical needs China has set up some types of preemption right but these regulations are mainly too general and of weak realizbility.We should learn from the examples of foreign legislation fo perfect the p...