With the deterioration of the environment and the shortage of natural resources, firms are facing increasing pressures to implement environmental management practices in their daily operation management. Drawing on institutional theory and environmental management literatures, this research tries to explore how institutional pressures motivate firms to implement environmental management practices, and how such effects are moderated by firms' environmental commitment and resource availability. The results of a survey of 188 Chinese firms suggest that regulatory pressures and normative pressures are positively and significantly related to firms' propensity to implement environmental management practices. Moreover, the results indicate that firms' environmental commitment positively moderates the relationships between institutional pressures and environmental management practices, while firms' resource availability plays different roles depending on the types of pressure (regulatory or normative pressures). Implications and suggestions for future research are provided. Copyright © 2017 John Wiley & Sons, Ltd and ERP Environment