摘要目的:探究本科护生积极心理资本在成就动机与拖延行为之间的中介作用以及积极完美主义对中介过程的调节作用。方法:采用整群抽样法，于2018年5—6月选取某医科大学护理学院1~4年级的550名本科护生为研究对象。采用一般资料调查表、成就动机量表（AMS）、积极心理资本问卷（PPQ）、多维完美主义量表的积极完美主义维度、一般拖延量表（GPS）对其进行调查。使用PROCESS软件进行有调节的中介效应分析。结果:发放问卷550份，最终回收有效问卷509份，有效回收率为92.55%。509名本科护生的GPS得分为（55.08±8.18）分，AMS得分为（-0.03±6.02）分，PPQ得分为（4.35±0.70）分，积极完美主义维度得分为（17.26±4.69）分。成就动机、积极心理资本、积极完美主义与拖延行为均呈负相关（ r值分别为-0.245、-0.415、-0.357； P<0.01）。积极心理资本在成就动机与拖延行为之间起部分中介作用，中介效应占总效应的42.31%；积极完美主义对积极心理资本中介作用的后半路径具有调节效应（ P<0.05）。 结论:本科护生拖延行为处于中等水平，成就动机可通过积极心理资本影响拖延行为，积极完美主义调节积极心理资本与拖延行为的关系。

abstractsObjective:To explore the mediating effect of positive psychological capital on achievement motivation and procrastination behavior of nursing undergraduates and the moderating effect of positive perfectionism on mediation.Methods:Using the cluster sampling method, a total of 550 nursing undergraduates from the 1st to 4th grades of School of Nursing of a medical university were selected as research objects from May to June 2018. General information questionnaire, Achievement Motivation Scale (AMS) , Positive Psychological Capital Questionnaire (PPQ) , positive perfectionism dimension of Frost Multidimensional Perfectionism Scale and General Procrastination Scale (GPS) were used for investigation. PROCESS software was used for moderated mediation effect analysis.Results:A total of 550 questionnaires were issued and 509 valid questionnaires were finally recovered, with an effective recovery rate of 92.55%. The GPS score of 509 nursing undergraduates was (55.08±8.18) , AMS score was (-0.03±6.02) , PPQ score was (4.35±0.70) and score of positive perfectionism dimension was (17.26±4.69) . Achievement motivation, positive psychological capital and positive perfectionism were all negatively correlated with procrastination behavior ( r=-0.245, -0.415, -0.357; P<0.01) . Positive psychological capital played a partial mediating role between achievement motivation and procrastination behavior, and the mediating effect accounted for 42.31% of the total effect. Positive perfectionism had a moderating effect on the second half of the mediating pathway of positive psychological capital ( P< 0.05) . Conclusions:The procrastination behavior of nursing undergraduates is at the middle level. Achievement motivation can influence procrastination behavior through positive psychological capital and positive perfectionism regulates the relationship between positive psychological capital and procrastination behavior.