Abstract: 【Objective】 The aim of this study was to reveal the change in growth and development of oilseedflax under different intercropping patterns,and to clarify the effects of different intercropping patterns on the accumulation and distribution of dry matter and on the yield of oilseed flax.【Method】 With single cropping oilseed flax（F） as control,The effects of different intercropping belt types（i. e.,4∶2,6∶3 and 8∶4） on the growth and development characteristics and grain yield of oilseed flax were studied in two intercropping systems of oilseedflax∶maize and oilseedflax||soybean by using a randomized group field experiment design.【Result】 All six intercropping patterns could increased dry matter accumulation of oilseed flax,among which the dry matter for intercropping pattern of 8-row oilseed flax with 4-row maize was 17. 1%～22. 7% higher than other intercropping patterns in anthesis to maturity. In the intercropping system of oilseed flax||maize（F∶M）,the dry matter distribution of capsules at maturity stage was 26. 2% higher in the 8∶4 belt types than in the 4∶2 belt types. The grain yield,capsule number,fruit grain number,1 000-seed weight of oilseed flax were 18. 4%,27. 1%,5. 9% and 10. 3% higher in oilseed flax∶maize（F∶M） than in oilseed flax∶soybean（F∶S）,respectively. In the F∶M system,these indicators were 27. 6%,22. 0%,7. 4%and 6. 7% higher in the 8∶4 belt types than in the 4∶2 belt types,respectively,and they were increased significantly by 50. 1%,58. 5%,17. 6% and 20. 5%,respectively,compared to the single cropping. The analysis of interaction effects showed that the interactive effects of intercropping crops and belt types arrangement were all statistically significant on dry matter accumulation,dry matter distributionin different organs,capsule number,fruit grain number,1 000-seed weight and grain yield of oilseed flax. To sum up,increasing the number of crop rows in intercropping system of oilseedflax and maize could significantly increase dry matter accumulation and its distribution in the capsules of oilseed flax,thereby increasing grain yield of oilseed flax.【Conclusion】 The intercropping pattern of 8-row oilseedflax and 4-row maize could be used as a suitable intercropping pattern for high grain production of oilseed flax in test area.