Abstract: 【Objective】To clarify the light,simple and efficient rotation pattern for dry land millet and bean.【Methods】Through 6 years of field positioning experiments,the photosynthetic characteristics,yield and benefit changes of millet and black bean under four planting patterns：black bean-millet（B-M/M-B）,black bean-black bean-millet（B-B-M）,black bean-millet-millet（B-M-M）,and black bean-potato-millet（B-P-M） were studied.【Results】In the three main growth stages,stomatal conductivity（G_s）,transpiration rate（T_r） and net photosynthetic rate（P_n） of the B-P-M pattern increased significantly（P<0.05）. The millet P_n and relative chlorophyll content （SPAD） were all significantly higher （P<0.05） than the other three patters. Different rotation pattern had significantly different （P<0.05） G_s of millet and black beans. Under B-P-M pattern,black bean and millet had the highest yield of 2 401.51 kg/hm² and 4 522.23 kg/hm²,respectively. The yield of B-M-M pattern were 2 336.66 and 3 479.25 kg/hm²,and yield of B-M/M-B were 2 265.32 and 4 250.55 kg/hm²,respectively. The benefit of B-M/M-B pattern was highest at 56 348.78 yuan/hm²,and output-input ratio at 2.18,followed by B-P-M pattern at 8 531.21 yuan/hm²,with output-input ratio at 1.80.【Conclusion】B-M/M-B pattern had the highest output-input ratio,suitable for promoting in dry land.

Key words: Rotation, Millet, Black bean, Photosynthetic characteristics, Yield, Benefit