In this study an experiment of the dual purpose use of oat (Avena sativa L.) and the effect of clipping at different grain stages on garin yield and some other characters of oat and Maquee barley, was conducted in Educational Field of Jihad- Agricultural Education Center of Shahrekord in 2000-2001. The experimental was a split plot in a randomized complete block design with three replications. Three clipping treatments; harvest at 5 and 10 cm growth and non harvest (control) were assigned as main plots, and five lines of oats (No: 2, 17,28,32 and 36) and Maquee barley (control) as sub plots. The results of ANOV A showed that clipping effects was significant on all traits except No. of grain and No. of tillers. Delay in harvest decreased, grain yield, biological yield, plant height, number of fertile tiller and 1000- weight grain, while sowing time to maturity, to heading and forage yield increased. There were significant differences among lines in height plant, maturity, heading, forage yield, grian yield, biological yield, No. of grain, harvest index and No. of tiller. Lines No. 2 and 17 had the highest grain and biological yields and had faster growth, while lines No. 28 and 32 had a low forage yield, grain yield and biological yield and due to their slow growth rate were not suitable for this region. There were significant interaction effects between clipping and line for plant height and grain yield. It was concluded that clipping in 2 and 17 oat lines could be done in other to supply the forage for livestock without any adverse effects on yield.