Abstract: This paper takes Jinyou NO.12 single planting mode as a control, the intercropping flax cultivation experiment of mustard type spring rape was carried out in the Maozao experiment base of Crop Research Institute of High and Cold Area, Shanxi Academy of Agricultural Sciences. The results showed that the marginal effect was obvious when the number of intercropping lines was 6:4, the plant height, stem diameter, effective branches, the number of pods per plant, the yield per plant, the quality and the yield of 1 000 seeds were all improved, the plant resistance to lodging and disease was less, the yield was 1 170 kg/hm2, increased by 34.5% compared with the control, the difference was significant, and the intercropping mode was suitable for local promotion.