Effect of sowing date on growth,yield and diseases and pests occurrence in sunflower Helianthus annuus L. were compared and the relationship between sowing date and occurrence degree of diseases and pests or yield were analyzed in the paper,aiming to reduce the occurrence of diseases and pests in sunflower by adjusting sowing date. The results showed that sowing date was obviously correlated with occurrence of diseases and pests in sunflowers,and appropriate sowing date could effectively reduce the occurrence degree of diseases and pests,beneficial to high yield and good quality. In the main sunflower producing area in Changji Hui Autonomous Prefecture of Xinjiang,it is more appropriate to sow sunflower in early and mid May,resulting in lighter occurrence of diseases and pests,and better yield and quality. Effect of sowing date on growth, yield and diseases and pests occurrence in sunflower Helianthus annuus L. were compared and the relationship between sowing date and occurrence degree of diseases and pests or yield were analyzed in the paper, aiming to reduce the occurrence of diseases and pests in sunflower by adjusting sowing date. The results showed that sowing date was clear correlated with occurrence of diseases and pests in sunflowers, and appropriate sowing date could effectively reduce the occurrence degree of diseases and pests, beneficial to high yield and good quality. In the main sunflower producing area in Changji Hui Autonomous Prefecture of Xinjiang, it is more appropriate to sow sunflower in early and mid May, resulting in lighter occurrence of diseases and pests, and better yield and quality.