Abstract:Phytosociological parameters, soil and temperature conditions, importance values of species, life form, leaf size and grass biomass in vegetation of Pirghar Hills, South Waziristan Agency, Pakistan, were investigated during summer 1995. The air and soil temperatures were higher on south facing slopes which decreased with increase in altitude.The vegetation, life form and leaf size of south and north slopes differed at similaraltitudes. Leptophyllous species increased with the rise in altitude. The fresh herbage production was 500 g m-2 at 2000 m on north slope which gradually decreased to 170 g m-2 at the hill top. A similar trend was observed for the south slope which had higher productivity than comparable north slope. The original woody species are present on the hills as isolated individuals due to degradation. There is need for restoration of the habitat.