Abstract: [Objective] To clarify the effect of mowing technique on yield and quality of forage grass in Leymus chinensis mowing meadow in Hulun Buir City, to determine the appropriate mowing period and mowing height （stubble height）, to obtain forage grass with high yield and quality, and to ensure the stable and sustainable utilization of mowing meadow. [Method] The Leymus chinensis mowing meadow in Hulun Buir City was used as experimental object, and three mowing periods and four stubble heights were set up. Field observation and indoor analysis were used to investigate the effect of different mowing techniques on aboveground biomass of vegetation community, nutrient contents of forage grass, and yield of crude protein （CP） per unit area. [Result] The aboveground biomass of vegetation community was affected by rainfall and fluctuated greatly among years, and the forage grass yield was impacted by mowing period and stubble height. The yield of CP per unit area depended on aboveground biomass of vegetation community. The vegetation community diversity index of early mowing was higher, and it increased with the reduction of stubble height. The yield of CP per unit area was higher when the forage grass was mowed around August 15 with stubble height of 5 cm. [Conclusion] The mowing period and stubble height have impact on the yield of forage grass, and the aboveground biomass of vegetation community determines the yield of CP per unit area. The suitable mowing time of Leymus chinensis mowing meadow in Hulun Buir City is around August 15, and the suitable stubble height is about 5 cm. The stubble height should be reduced in drought years.

Key words: Leymus chinensis mowing meadow, mowing technique, forage grass yield, forage grass quality