This study used a person‐centered approach to examine the across‐time relationships between job demands and job resources of Chinese nurses and police officers on the one hand and their well‐being (burnout and work engagement) on the other. It was expected that increases in demands and decreases in resources across time would result in unfavorable changes in well‐being. The results showed that (a) respondents who experienced an increase of demands showed a significant increase in burnout; (b) respondents who reported having low resources at both occasions also showed a significant increase in burnout; (c) respondents who experienced decreasing resources reported a significant increase in burnout and a significant decrease in engagement; (d) respondents who were exposed to chronic low job resources in a highly demanding environment showed a significant increase in burnout; and (e) respondents who were exposed to decreased job resources in a highly demanding environment showed a significant increase in burnout. So indeed, changes in demands and resources correspond with changes in employee well-being (read more).