Abstract: ObjectiveTo examine the time to pregnancy(TTP)and its influencing factors among reproductive couples in their first marriage.MethodsDescriptive and logistic analysis methods were applied to analyze the information on 13 189 couples during their first two-year marriage collected with a cross-sectional survey in 2007 in Guangdong province.ResultsThe estimated median of TTP for all the couples was 5.67 months.The TTP changed by 1.008 times with a one-year increment of age of the women.The TTP changed by 1.022 times with a one-year increment of age at first menstruation.The TTP of those wives with irregular menstruation was 1.280 times longer than that of wives with regular menstruation.The TTP for the wives with education above high school was 1.140 times as that of the the wives with an education of primary school or below.The TTP of the female migrant workers or workers was 1.110 times as that of female farmer. The TTP for the women with smoking husbands was 1.182 times as that of the women with non-smoking husbands.ConclusionThe biological factors,such as age and menopause status,of the married women have significant effect on their TTP than other factors.