Effects of various contents of Asarum heterotroidees root extracts (ARE) and Asarum heterotroidees root decomposition (ARD) and sterilized ARD (SARD) on seed germination and seedling growth of wheat and cucumber were conducted using approach of biological assays and pot experiments. Allelopathic effects of ARE and ARD on the two receptor plants were also carried out by adopted roots activities, germination rate, seedling growth, content of protein & chlorophyll and other related physiological indexes as indicators. The result showed that there were no significant effects of ARE on seed germinations of wheat and cucumber at lower concentrations (25 mg/mL), significant effects, while, were occurred at higher concentration (100 mg/mL). Root activities, content of protein & chlorophyll declined with the concentration of ARE increase. The inhibition effects of ARD on seed germination, seedling growth and some physiological activities of the two plants were significantly higher than those treated by ARE (P<0.05). The activity of cucumber roots with respective high, moderate (50 mg/mL) and low concentrations treatments were declined by 25.5%, 43.8% and 62.8% compared to that in ARD, respectively. The inhibition effects could be ranked by ARD, SARD, ARE in order with three treatments. In general, some allelochemicals decomposed from A. heterotroidees roots might be released into soil, which would interfere in the early growth and physiological metabolism of wheat and cucumber. However, microbes might affect the allelopathic activity of decomposed products from A.heterotroidees roots.