Abstract: 【Objective】To screen out new soybean varieties and provides technical support and theoretical basis for soybean breeding in the central and western regions of Inner Mongolia.【Methods】The photosynthetic capacity,agronomic characters and yield factors of 11 new strains of northern spring soybean were compared with the control varieties,and the correlation analysis was conducted.【Results】The accumulation of dry matter and SPAD value of different varieties increased gradually with the growth period;the number of growing days was 110 to 122 days,and all varieties could mature normally in the region;the protein content of each strain varied from 33.20% to 37.30%,and mk-10 increased by 0.78%,the fat content varied from 20.90% to 22.90%,and mk-8 increased by 9.57%,the total amount of egg fat varied from 56.10% to 59.10%,and mk-10 increased by 2.07% compared with the control（P<0.05）;the range of yield change as mk-7>mk-9>mk-1>mk-8>mk-4>mk-2>mk-11>mk-3>mk-10>CK>mk-6>mk-5,The highest yield of mk-7 was 3 370 kg/hm² and 11.74% higher than the control （P<0.05）,there was significant positive correlation between yield and 100 kernel weight,kernel weight per plant,kernel number per plant,pod number per plant,total egg fat and protein （P<0.01）,it was positively correlated with the height of bottom pod,negatively correlated with the number of main stem nodes （P<0.01）,negatively correlated with fat content （P<0.05）,and negatively correlated with the number of effective branches.【Conclusion】The yield of mk-7,mk-9,mk-1 and mk-8 was 5.00% higher than the control,and the plant height,yield potential of the 4 soybean varieties were suitable in the central and western regions of Inner Mongolia.

Key words: Soybean varieties, Photosynthetic productivity, Agronomic characters, Quality, Yield