In　this　article,　a　class　of　Mantel-Haenszel　type　estimators　of　hazard　ratios　in　proportional　hazards　model　is　presented　for　simple　nested　case-control　study.　The　estimators　have　the　form　of　the　Mantel-Haenszel　estimator　of　odds　ratios,　and　it　is　shown　that　the　estimators　are　dually　consistent,　and　asymptotically　normal.　Dually　consistently　estimated　covariance　matrices　of　the　proposed　estimators　are　also　developed.　An　example　is　given　to　illustrate　the　estimators.