2020年初，新冠肺炎疫情在全球暴发，此次重大突发性社会事件不仅对人们的生命和财产带来威胁，一定程度上也对人们的心理健康带来严重危害。相关机构调查数据显示，超过80%的受访者有过抑郁、焦虑等情绪困扰（简单心理，2021）。过往研究指出重大社会事件如非典（SARS）、甲型H1N1流感会使得人群陷入紧张、焦虑的状态（钱铭怡等，2003）。相比于非典（SARS）、甲型H1N1流感，新冠疫情的影响更具广泛性、持续性和复杂性，容易造成整个社会的情绪高压。因此关注疫情对民众的心理健康造成的影响显得尤为重要。同时，疫情强大的杀伤力使得不少行业受到冲击，各行各业的工作者都或多或少被疫情打乱了原本的工作节奏，工作环境中充满了不确定性，而不确定性正是引发工作不安全感的重要因素之一。

综上所述，本研究将关注疫情压力给民众心理健康造成的影响，并探究其内在作用机制。将工作投入作为中介变量，进一步探究疫情背景下的工作不安全感对心理健康的影响。本研究通过在全国范围内发放电子问卷，回收有效数据1021份，被试平均年龄为30.4岁（SD  = 3.20），运用SPSS22.0和Mplus 7.11进行数据分析，结果如下：

（1）疫情压力感知正向预测个体心理健康（抑郁和焦虑）。

（2）疫情压力感知、工作数量不安全感、工作质量不安全感、焦虑和抑郁水平在教育程度上有显著差异，工作数量不安全感、工作质量不安全感、工作投入、焦虑和抑郁水平在婚姻状况上存在显著差异，疫情压力感知、工作数量不安全感、工作质量不安全感、工作投入、焦虑和抑郁水平在工作年限上存在显著差异。

（3）工作数量不安全感显著正向预测个体的心理健康（抑郁和焦虑），工作质量不安全感对个体的心理健康水平的直接预测作用不显著，工作质量不安全感通过工作投入正向预测个体的心理健康水平。

（4）疫情压力感知对个体工作投入的影响存在遮掩效应，具体来讲，疫情压力感知对个体工作投入的积极影响被工作质量不安全感的消极影响所抑制。

In early 2020, COVID-19 outbroke in the world, which not only brought a certain degree of threat to people’s lives and property, but also posed serious harm to people’s mental health. According to the data in public mental health insight report of 2020, more than 80% of the respondents said they had experienced depression, anxiety and other emotional problems(Jian Dan Xin Li, 2021). Previous studies have shown that major social events such as SARS and H1N1 can lead people to a state of tension and anxiety (Qian Mingyi et al., 2003). Compared with SARS and H1N1, the impact of COVID-19 is more extensive, continuous and complex, which is likely to cause high emotional pressure in the whole society. Therefore, it is particularly important to pay attention to the impact of the epidemic on people’s mental health. At the same time, the powerful lethality of the epidemic has impacted on many industries. Both stable office workers and migrant workers are more or less disrupted by the epidemic. The working environment is full of uncertainty, and which is one of the important factors leading to work insecurity.

In conclusion, this study will focus on the impact of epidemic pressure on people’s mental health, and explore its internal mechanism. Through online questionnaires, 1021 workers with an average age of 30.4（SD  = 3.20）were recruited. The results are as follows: 

(1) The perception of epidemic stress have a negative impact on mental health

(2) There were significant differences in educational level between the perception of epidemic stress and insecurity of work quantity, insecurity of work quality, anxiety and depression. There were significant differences in marital status between the perception of epidemic stress, insecurity of work quantity, insecurity of work quality, anxiety and depression. There are significant differences in working years in terms of engagement, anxiety and depression. 

(3) Quantitative job insecurity significantly positively predicts employees' mental health level (depression and anxiety). Qualitative job insecurity can not significantly predict employees' mental health level, but can predict employees' mental health through the complete mediating effect of job engagement. 

(4) Specifically, the positive impact of epidemic stress perception on individual work engagement is inhibited by the negative impact of Qualitative job insecurity.