Abstract: Social egg freezing is a rational choice for women to preserve their reproductive ability. It fundamentally aims to realize the preservation of reproductive opportunities. As far as women's reproductive behavior is concerned， they are often faced with unfavorable situations from the fertility law， subject identity and social structure， which will lead to the double imprisonment of “internal and external factors” in the process of reproductive selection. In this regard， some women hope to set up “reproductive insurance” for them by social egg freezing， so as to realize their main demands of “free choice of fertility”， “relief for loss of reproductive opportunities”， “protection of equal reproductive opportunities” and “maintenance of reproductive dignity”. Based on this， we will defend the rationality of social egg freezing from the perspective of liberalism， the protection of legal rights， humanistic care and external experience. However， social egg freezing may also lead to a series of social risks， such as the commercial use of egg freezing， the objectification of women， disputes over egg freezing right ownership and social structure stratification and other practical concerns. Therefore， it is necessary to set necessary limits on social egg freezing behavior， carry out value guidance and technical regulation， and ultimately establish an ethical and legal framework for social egg freezing risk control.

Key words: social egg freezing; fertility opportunity; justification basis; behavior boundary