[Objective] In order to address the "low yield" issue caused by no irrigation in the east Greater Khingan Range region of Inner Mongolia

high yield and high efficiency irrigation programs are needed in this region.[Methods] We took the traditional soybean as the test crop

to investigate the crop yield

water productivity and economic benefits under sprinkler irrigation system.[Results] The local agriculture model could not provide enough water for soybean growth without irrigations. The soybean yield increased by 20% when irrigated 2 times by using the sprinkler irrigation technique

but the economic benefits were not improved. The total soybean yield was the highest when irrigated 4 times by using the sprinkler irrigation technique

but the soybean crop water productivity was lower

compared to the crop irrigated by 3 times

and unnecessary waste of water resources occurred.[Conclusion] By 3 times irrigation with 200 m3/hm2 quota of water in different growing periods(flowering

fruiting and seed filling periods) of soybean

the soybean production can be increased by 47.8%

and the maximum economic benefits can be obtained.