Objective To assess the relationship among body mass index ( BMI ) , body weight perception, and efforts to lose weight in a public sample of women who were overweight and obese, to examine whether body weight perception plays the mediating role between BMI and weight loss efforts. Methods The sample was 1 739 women who were above 20 years old with the BMI≥23 kg/m2 . Bivariate relationships among variables of interests were assessed. Three separate regressions were used to test the mediating role of body weight perception on the relationship between BMI and weight loss efforts. Results BMI and body weight perception were significant correlates with weight loss efforts. BMI was significantly associated with weight perception, but a large proportion of women underestimated their weight. Weight perception partially mediated the relationship between BMI and weight loss efforts in women. Conclusions In light of the high prevalence of overweight or obesity and the many health problem sassociated with obesity, women should be awared of the healthy body weight and try to achieve that. Nursing interventions should be considered the body weight perception to effectively motivate overweight and obese women to lose weight as necessary.%目的：评估超重或肥胖妇女的感觉体质量、体质量指数( BMI)和减肥意愿三者之间的关系，确认感觉体质量是否在BMI和减肥意愿之间起中介作用。方法选取2012年5月—2014年5月就诊的符合条件的妇女问卷，对其进行横断面研究。样本中1739名妇女年龄在20岁以上且BMI≥23 kg/m2。分析研究变量之间的双边关系，建立3个独立的回归模型来判别感觉体质量在BMI和减肥意愿之间的中介作用。结果 BMI与感觉体质量均与减肥意愿密切相关。 BMI与感觉体质量也具有相关性，但大多数妇女都低估了她们的体质量。一定程度上感觉体质量能在BMI和减肥意愿之间起中介作用。结论由于超重及肥胖在我国妇女中越来越普遍，由此引发的健康问题也不容小觑，护理人员应该采取有效措施使超重及肥胖妇女对其体质量有一个正确的认识，激励其进行减肥，从而使身体维持在一个健康的体质量水平。
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