近幾十年已婚婦女受教育年數延長,勞動參與提高及生育觀念改變等因素下,促使生育率每況愈下,近幾年甚至達不到人口替代水準窘境。因此本文欲探究影響已婚婦女生育子女數因素為何。 為了解影響已婚婦女生育子女數因素為何,本文以採用Ordered Probit Model作為實証模型,行政院衛生署國民健康局「民國97年第10次家庭與生育力研究調查-已婚問卷」部分為資料來源。本文以個人特性變數、家庭結構及經濟狀況來探討對於已婚婦女生育子女數影響,並以完成生育歷程之40歲以上已婚婦女、實際生育子女數等於預期子女數已婚婦女,分族群比較,經實證結果得知,除了所得因素考慮以外,妻子個人主觀意識及家庭背景是占家庭生育決策上很大因素。As the factors of the extended education, the increase of labor involvement and the change of fertility, leading the birthrate descends even can’t reach replacement in recent year. This article will discuss how the impact factors of birth. This article uses Ordered Probit Model which is from “The 10th married urvey of Family Growth in 2008” by Bureau of Health Promotion, Department of Health,ROC(Taiwan) to understand how the impact factors of birth. And it will discuss the impct factors on variables personal characteristics, family structures and economic conditions. The married women over 40 who accomplished bith and the expected is equal the fact. Comparing the different races, we can know the women’s personal thoughts and family backgrounds are the large impact factors of determination of birth.