Since the founding of the Peoples Republic of China, its population reproduction has transformed from a traditional to a modern one. During this process, the life expectancy of the population has continued to increase, and the sex difference in life expectancy has also been changing. In 1953, the life expectancy of Chinese men and women was 44.54 and 44.58 years, respectively, and the difference was only 0.04 years. By 2010, the life expectancy of men and women reached 72.38 and 77.37 years, respectively, and the difference was 4.99 years. The sex gap in the proportion of people aged 100 and over in the whole population has also widened. The change of the sex gap in life expectancy reflects the law of population development. Chinas legal development and policies have supported gender equality, which promotes the formation of genderless consciousness in social roles and thus benefits women. Ultimately, womens lifespans have extended.