Abstract: Seed morphology and effects of water extracts of pulp, seed and decoated seed on germination of cabbage and wheat seeds were studied. The results showed that the pulp, seed and decoated seed contain soluble inhibiting substances and the content decreased as the increasing of soaking time. The inhibition substances in Sorbus pohuashanensis(Hance)Hedl fruit not only restrained the seeds of wheat, cabbage from germinating but also restrained height and root growth. After the seeds of wheat, chinese cabbage had been soaked in the water extraction of pulp, seed and decoated seed for 8h, the seed germination rates were 92% and 84%, 89% and 65%, 94% and 78%, lower than the control, especially the water extract of decoated seed; and the root length and seedlings height were lower than the control, especially the water extract of pulp, and decreased in sequence of soaking time from short to long. So the simplest and effective method to eliminate pulp soluble inhibiting substances is to wash fruits by flowing tap water soon after collection. The seed contains some substances that inhibit seed germination, and lead to low germination.