This study examine strends in the marriage squeeze in Taiwan using the theoretical redundant ratio of male births and sex ratio at marriage( MR) with Taiwan’s population data from 1970 to 2014．MR in Taiwan kept increasing and the theoretical redundant ratio of male births had a modest rise from 1970 to 2014，implying that Taiwan’s male marriage squeeze would be also on the rise in the future．Comparative analysis shows that the theoretical redundant ratio of male births in Taiwan was lower，but the MR was higher than those in the mainland from 1987 to 2013．Our analysis suggests that marriage match is a result of both the individual subjective preferences and the objective condition of the marriage market structure．Macro structure of sex and age are the predisposing factors affecting marriage squeeze，while the fundamental factors affecting marriage squeeze are family background，sociocultural context，and economic and job conditions．

This paper develops a theoretical model of long-term balanced population development，in which long-term balanced population development incorporates internal balance，external balance and overall balance of the population system leading to coordination and sustainability． According to the theoretical
model，the paper constructs an index system and evaluation model of long-term balanced population development，evaluating the extent to which balanced development，coordination and sustainability are achieved．An empirical analysis of the model is conducted using data from Sichuan Province over 1982-2010 to assess the long-term population development in Sichuan province． Results suggest that a great progress has been made in the long-term balanced population development of Sichuan in the past thirty years． However，challenges remain．