Convenience samples of 74 women in gestational week of 8–12 with a BMI≥24kg/m2 were enrolled. They were divided into intervention (N=37) or control group (N=37) . Follow-up phone calls or emails were conducted every week between antenatal visits. The control group was just provided with exercise, dietary and weight gain counseling at weeks 8–12, besides of the usual health education provided at the O&G outpatient department.