The gestational weight gain (GWG) range of Chinese women with gestational diabetes mellitus (GDM) still remains unclear. Our objective was to identify the ranges of GWG in Chinese women with GDM, and to investigate the associations between pre-pregnancy body mass index (BMI), GWG and maternal-infant adverse outcomes. GDM Women delivering singleton from 2013 to 2018 in a tertiary public hospital were collected. Logistic regression analysis was used to assess the joint effects of pre-pregnancy BMI and GWG on maternal-infant adverse outcomes. Finally, 14,578 women were collected. The ranges of GWG of Chinese women with GDM in the underweight, normal weight, overweight and obese groups were 5.95-21.95kg, 4.23-21.83kg, 0.88-21.12kg and-1.76-19.95kg, respectively. The risks of large for gestational age (LGA), macrosomia and cesarean delivery were significantly increased with the increase of pre-pregnancy BMI. Furthermore, the risks of LGA, macrosomia and cesarean delivery were significantly higher in normal weight group with GWG higher than the National Academy of Medicine’s (NAM) recommendation. Similarly, in overweight group with GWG higher than NAM recommendation, the risks of LGA were significantly higher, while, the risks of macrosomia were significantly lower. In conclusion, the ranges of GWG in GDM women were different with NAM recommendation.