Highland barley is the main food crop in plateau area. Based on the household survey data of 427 barley farmers in Tibet,an empirical analysis of barley planting efficiency at regional level and planting scale level was carried out in the paper using input-oriented DEA-CRS and DEA-VRS model. The results showed that at the regional level,the effectiveness of DEA was achieved in Shigatse in the five regions surveyed,but ineffective in other areas. The comprehensive efficiency values from high to low were Shannan,Lhasa,Chamdo and Linzhi in turn.From the view of planting scale,the higher the planting scale was,the higher the comprehensive efficiency value was. On the whole,the main reason for the inefficiency of DEA lied in the inefficiency of production scale,which was in an increasing range,and the scale benefit has not been fully brought into play. Projection analysis confirmed that there were redundancies in sowing area,labor force and capital cost input and there was no insufficient output.Input resources have not been effectively utilized,and there was a big waste.