The aim of this study was to determine the level of knowledge and participatory practice of Husbands, pregnant women referring to public maternity hospitals in Qom about the role of father in 2015. The type of research was descriptive and analytical. The data were collected using questionnaire. 226 fathers were randomly selected in government maternity hospitals in Qom. The information related to this study was described after entering the SPSS software using central indicators and dispersion and statistical tables. In the data analysis section, Pearson test and analysis of variance were used. The results revealed that although the mean of knowledge of the subjects was moderate, the mean of participation was high and there was no significant relationship between the variable of participation and the variable of knowledge among the respondents. Men's understanding of the concept and role of fatherhood in Iran is also changing and fathers, while adhering to traditional plans, have accepted new roles such as presence with the child, emotional support and family participation. However, there seems to be a long way to go before men become a real conscious and participatory father. It is expected that by providing sufficient knowledge, skills and support, fathers can be helped to cope more easily with their fatherly roles and responsibilities and participate more actively in child rearing.