This study was to examine the effect of person-environment fit(PEF) on perceived organizational support(POS) and proactive behavior(PB). It also investigated the mediating effect of POS on the causal relationship between PEF and PB. In this study, hotel employees`` PEF was conceptualized in terms of person-organization fit(POF), person-supervisor fit(PSF), and person-job fit(PJF). A sample of 320 employees from 13 five-star hotels in Seoul was used to test the hypotheses of this study. Results showed that POF and PSF significantly influenced on POS, while they did not make a signifiant impact on PB. Results also indicated that PJF was related to both POS and PB. Furthermore, the effect of POF and PSF on PB were fully mediated by POS, while the effect of P-J on PB was partially mediated by POS. Limitations of this study and future research directions were also discussed.