Aim To identify the intention of Chinese pregnant women to undertake physical activity (PA) using the theory of planned behaviour. Design A cross-sectional survey. Methods From April - October 2017, a cross-sectional questionnaire was completed by 746 pregnant women from the Health Birth Cohort in Wuhan, China. The theory of planned behaviour variables as well as sociodemographic characteristics was recorded, and the Pregnancy PA Questionnaire was together used to assess their PA during pregnancy. Results Only 11.3% of the women met the international guideline. The intention to undertake PA wa...