目的 探讨中青年脊髓损伤（spinal cord injury， SCI）患者反刍思维和应对方式在社会支持与创伤后应激障碍（post -traumatic stress disorder， PTSD）间的中介作用，为制定针对性的干预措施提供依据。 方法 以便利抽样法选取240例住院治疗的中青年SCI患者，使用一般资料调查表、领悟社会支持量表（PSSS）、简易应对方式量表（SCSQ）、事件相关反刍思维量表（ERRI）和创伤后应激障碍自评量表平民版（PCL-C）进行问卷调查，使用SPSS25.0中Process4.1插件的 Model-6进行中介分析。 结果 中青年SCI患者PTSD、社会支持、反刍思维、积极应对和消极应对得分分别为29.00（26.00，35.75）、67.00（62.00，70.00）、37.00（34.00，41.00）和36.00（33.00，42.00）；PTSD与社会支持、积极应对呈负相关（r = -0.553、r = -0.484，P < 0.001），与消极应对、反刍思维呈正相关（r = 0.499，r = 0.472，P < 0.001）；中介模型检验显示，反刍思维和积极应对、消极应对在社会支持与PTSD间的中介作用显著，效应值分别为-0.078 1、-0.097 0和-0.049 6，分别占总效应的17.81%、22.12%和11.31%，反刍思维和积极应对、消极应对的链式中介效应分别显著，效应值分别为-0.026 3、-0.026 2，分别占总效应的5.99%和5.97%。 结论 反刍思维和应对方式在中青年SCI患者社会支持和PTSD之间起着简单和链式中介作用。医务人员在制定改善和预防患者PTSD的相关干预措施的时候要注重反刍思维和应对方式的中介作用，可以从提高患者的社会支持水平，降低反刍思维水平，引导患者积极应对疾病等方面来改善和预防患者的PTSD。

Objective The present study aims to explore the mediating role of rumination and coping styles in social support and post -traumatic stress disorder（PTSD） in young and middle-aged spinal cord injury（SCI）patients. The study will provide a basis for developing targeted interventions. Methods Two hundred and forty young and middle-aged SCI patients hospitalized for treatment were selected by convenience sampling and questionnaires were administered using the General Information Questionnaire， the Perceived Social Support Scale （PSSS）， the Simplified Coping Style Questionnaire （SCSQ）， the Event Related Rumination Inventory （ERRI）， and the Post-traumatic Stress Disorder Self-assessment Scale （PCL-C），Mediation analysis using Model-6 with Process4.1 plugin in SPSS 25.0. Results The mean scores for PTSD， social support， rumination， positive coping， and negative coping in young and middle-aged SCI patients were 29.00 （26.00， 35.75）， 67.00 （62.00， 70.00）， and 37.00 （34.00， 4 1.00）， and 36.00 （33.00，42.00）， respectively. PTSD demonstrated a negative correlation （r = -0.553， r = -0.484， P < 0.001） and a negative correlation with positive coping and rumination （r = 0.499， r = 0.472， P < 0.001）. The mediation modelling test demonstrated that rumination and positive and negative coping mediated significantly between social support and PTSD， with effect values of -0.078 1， -0.097 0 and -0.049 6， accounting for 17.81%， 22.12 % and 11.31% of the total effect， respectively. Furthermore， the chain mediation effects of rumination and positive coping and negative coping were also significant， with effect values of -0.026 3 and -0.026 2， accounting for 5.99% and 5.97% of the total effect， respectively. Conclusions The present study hypothesises that rumination， thinking and coping styles play a simple and chain-mediating role between social support and PTSD in young and middle-aged SCI patients. Medical professionals should focus on the mediating role of rumination and coping styles when developing interventions related to improving and preventing PTSD in patients， which can be done by increasing the level of social support for patients， decreasing the level of rumination， and guiding patients to positively cope with their illness.