本研究旨在考察媒体形象内化和高中生瘦身倾向之间的关系，并进一步探讨二者的关系机制——中介效应和调节效应，具体考察外表焦虑在媒体形象内化对瘦身倾向影响中存在的中介作用以及自我感知的外表吸引力在此中介作用中的调节作用。

本研究采用问卷调查法，对广东一所高中的1343名学生进行问卷调查，使用的测量工具分别是：关于外表的社会文化态度问卷修订版、社会外表焦虑量表、进食障碍——瘦身倾向分量表、身体态度问卷—外表吸引力分问卷。并使用 EpiData进行问卷录入，SPSS 24.0 以及SPSS PROCESS宏程序对问卷数据进行分析处理。结果如下：

（1）媒体形象内化、外表焦虑、瘦身倾向与自我感知的外表吸引力在性别上均存在显著差异，具体表现为女生的媒体形象内化、外表焦虑和瘦身倾向显著高于男生，自我感知的外表吸引力显著低于男生。

（2）高中生媒体形象内化、外表焦虑与瘦身倾向两两之间存在显著的正相关关系；自我感知的外表吸引力分别与外表焦虑、瘦身倾向之间存在显著的负相关关系。

（3）高中生媒体形象内化能够显著正向预测瘦身倾向，媒体形象内化程度越高，瘦身倾向越严重。

（4）外表焦虑在媒体形象内化对瘦身倾向的影响中起部分中介作用。

（5）自我感知的外表吸引力对外表焦虑的中介效应起调节作用，具体表现为低自我感知的外表吸引力的个体，外表焦虑在媒体形象内化对瘦身倾向影响的中介效应中，其前半段和后半段路径均更加显著。

（6）性别在媒体形象内化对瘦身倾向的直接效应以及外表焦虑的中介效应后半段中起到调节作用，具体表现为对于女性青少年来说，媒体形象内化对瘦身倾向的直接效应更加显著，外表焦虑的中介效应中，其后半段路径也更加显著。

本研究结果表明，媒体形象内化对高中生的瘦身倾向存在正向影响，并且外表焦虑在其中起中介作用，自我感知的外表吸引力与性别起调节作用。

In this study, we aim to inspect the relationship between internalization of media appearance and adolescents' drive for thinness, and to further explore the mediating effect and moderating effect of the two mechanisms, specifically to investigate the mediating effect of appearance anxiety in the influence of internalization of media appearance on drive for thinness and the moderating effect of self-perceived physical attractiveness in the influence of internalization of media appearance on drive for thinness.

In this study, a questionnaire was used to survey 1343 students in a secondary school in Guangdong, using the following measurement instruments: the revised version of the Sociocultural Attitudes Toward Appearance Questionnaire-3, the Social Appearance Anxiety Scale, the Eating Disorder Inventory-Drive for Thinness Subscale, and the Body Attitudes Questionnaire-Attractiveness Subscale. The questionnaires were entered using EpiData, and the data were analyzed and processed using SPSS 24.0 and SPSS PROCESS macro programs. The results were as follows.

There were significant differences in Internalization of media appearance, appearance anxiety, drive for thinness and self-perceived physical attractiveness by gender, specifically, girls’ internalization of media appearance, appearance anxiety and drive for thinness were significantly higher than boys’, while self-perceived physical attractiveness was significantly lower than boys’.

There were significant positive correlations between internalization of media appearance, appearance anxiety and drive for thinness of high school students; there were significant negative correlations between self-perceived physical attractiveness and appearance anxiety and the tendency to lose weight.

Internalization of media appearance can significantly predict the drive for thinness of high school students, and the higher the degree of internalization of media appearance, the more severe the tendency to drive for thinness.

 Appearance anxiety played a partial mediating role in the influence of internalization of media appearance on drive for thinness.

Self-perceived physical attractiveness moderated the mediating effect of appearance anxiety, specifically for individuals with low self-perceived physical attractiveness. In the mediating effect of internalization of media appearance on drive for thinness, the mediating effect of appearance anxiety was more significant in the first half and the second half.

Gender played a moderating role in the direct effect of internalization of media appearance on drive for thinness and the second half of the mediating effect of appearance anxiety. Specifically, for female adolescents, the direct effect of internalization of media appearance on drive for thinness was more significant, and  the second half of the mediating effect of appearance anxiety is also more significant than boys.

The results of this study suggest that there is a positive effect of internalization of media appearance on high school students' drive for thinness, and that appearance anxiety plays a mediating role, and self-perceived physical attractiveness plays a moderating role with gender.