民法为避免无主物之产生、贯彻遗嘱之自由及保障交易之安全而设置继承制度。以被继承人意思之推测为基础,辅之以对遗产贡献之评价、继承人生活之保障,构成现代意义上继承权之根据。继承开始前继承人的地位缺乏必要的稳定性,“继承期待权”的说法不成立。继承法律关系,实为遗产归属人与不特定人的法律关系。继承开始后,继承人当然取得既得权,对遗产享有支配权。 Civil Law to avoid the creation of the main thing, to implement the freedom of wills and to protect the security of transactions and set up inheritance system. It is based on the conception of heir, supplemented by the evaluation of inheritance, the protection of heir’s life, and the basis of right of inheritance in the modern sense. The succession heirs before the beginning of the status of the lack of the necessary stability, “inherited expectation ” argument does not hold. Inheritance of legal relations, in fact, the legal relationship between the attribution of the estate and non-specific people. After the beginning of the succession, the heirs, of course, acquired the vested rights and enjoyed the dominance of the estate.