Carbon sequestration study was conducted in two rangeland grasses and in field area of Rangeland Research Institute (RRI), National Agricultural Research Centre, (NARC), Islamabad. Carbon is considered as the most important component of green house gases. Carbon sequestration during the photosynthesis process via plant biomass is the extent of this atmospheric gas. Data for above and below phytomass for two rangeland grasses was collected and carbon pool was estimated by Wet Combustion and Dry Combustion method. Four transect lines were drawn in each experimental plot. Twenty four samples of each experimental plot were collected with the help of ADC one m quadrat method, weighed and then oven dried at 60 C to find out the dry weight for above phytomass carbon Mg C ha . Similarly, the one m quadrats were dig out up to the root level for each grass and separated the root portion and weighed, oven dried at 60 C for below ground phytomass carbon Mg C ha estimation. Carbon pool in above ground phytomass was 1.16 Mg C ha while below ground phytomass, 0.29 Mg C ha was recorded. The carbon sequestration in below ground and the aerial phytomass depends upon the management practices, climate and response of different species.