Vegetation was compared in three tropical Shorea robusta forests, viz., Terai pure Shorea robusta forest (TPSRF), Terai mixed S. robusta forest (TMSRF) and Hill S. robusta forest (HSRF), in the Royal Bardia National Park, Nepal. A total of 45 permanent research plots (25 x 25 m) were established laid to assess the vegetation characteristics. The upper canopy of all the three forest types was mainly dominated by Shorea robusta and Terminalia alata [ T. elliptica ]. However, in each forest type, the extent of dominance varied considerably. Total density ranged between 332 stem ha^-1 in the TMSRF and 432 stem ha^-1 in HSRF and the total basal area ranged between 29 m²ha^-1 in TMSRF and 36 m²h^{- 1} in TPSRF. In TPSRF and HSRF, both density and basal area were greatest for Shorea robusta , while in TMSRF, density and basal area were higher for Terminalia alata . The distributionof trees ( more than or equal to 10 cm dbh) among diameter classes showed a higher density of stems with 10-20 cm diameter at breast height. The highest above ground biomass of 348.02 tonha^-1 was found in TMSRF followed by 330.87 ton ha^-1 in TPSRF and 267.3 tonha^-1 in HSRF. From the smaller basal area and biomass, and higher stem density, it is concluded that these forests are relatively young and in a state of regeneration.