The development of mankind has reached the point that a variety of new resources need to be tapped in order to fill our basic needs for food, feed and freshwater. Halophytes such as Kochia scoparia, Atriplex dimorphostegia, Suaeda arcuata and Gamanthus gamocarpus are widely grown in salty lands of central Iran. Halophyte is a plant that naturally grows where it is affected by salinity in the root area or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs, and seashores. These plants are grazed by sheep, goats and camels, specially during the prolonged seasons of drought. The dynamic interactions within the rumen are difficult to simulate. In situ techniques allow us to study digestion within the rumen itself and reduce the need for ruminal simulation. Such techniques have been used extensively during the last two decades (Vanzant et al, 1998). The aim of this study was to determine the in situ dry matter and crude protein degradability of some halophytes located of central Iran.