目的：探讨空间环境对药用植物的影响。方法：以药用植物红花种子为材料，搭载返回式人造地球卫星，回到地面后，种子贮存于０～４℃条件下，次年春季播于实验田中，于开花期取叶片研究其过氧化物酶、蛋白质及超微结构的变化。结果：飞行组的过氧化物酶活性低于地面对照组，可溶性蛋白质含量高于地面对照组。地面和飞行组的过氧化物酶和蛋白质电泳图谱的主要谱带相同，一些谱带有所区别。飞行组叶绿体的超微结构有一定变化。结论：空间环境对红花有一定影响，两次卫星搭载的实验结果基本一致。 Objective: To explore the impact of space environment on medicinal plants. Methods: The medicinal plant safflower seeds were used as materials, and the artificial earth satellites were equipped with return artificial earth satellites. After returning to the ground, the seeds were stored at 0-4 ℃ and sowed in the experimental field in the following spring, Oxidase, protein and ultrastructure changes. Results: The peroxidase activity of flight group was lower than that of ground control group, and the content of soluble protein was higher than that of ground control group. The main bands of the peroxidase and protein electrophoresis patterns were the same for ground and flight groups with some bands being different. The ultrastructure of chloroplast in flight group changed to some extent. Conclusion: The space environment has a certain impact on safflower, the experimental results carried by the two satellites are basically the same.