Objective To know the current status of smoking behaviors of the newborns' fathers.Methods The researchers gathered the data about their smoking behavior and the influencing factors of the subjects in this investigation, and applied the way of the cluster-sampling and the questionnaire to get the data.In the end, the data was inputted into the computer, and analyzed with SPSS 11.5.Results The rate of smoking of the subjects (namely, the fathers of the newborns in this city) is 90.2% in the past and 51.0% at present.The rate of smoking of the newborns' fathers indoor is 80.0% in the past and 40.1% now.The influencing factors include the subjects' occupation, education level and attitude to smoking, as well as the birth of the newborn and the wife's attitude to smoking.Conclusions The smoking in the newborns' fathers in Chengdu City should not be neglected.It will produce better effects if the measures for individual controls of smoking are taken to intervene the behaviors.