Abstract: The seedlings of Astragalus adsurgens Pall. were treated with low-voltage direct current electric（DC）field of different intensity.The changes of plant height, plant stem, root length, biomass, chlorophyll content, fluorescence kinetics parameters, antioxidant enzyme activities and soil enzyme activities of root system were measured 30 days after adding electricity. The results showed that in the growth process of Astragalus adsurgens Pall. seedlings, the Fv/Fm of seedlings in the three regions of anode, middle and cathode increased to a certain extent with the increase of the electric field intensity when the low-voltage DC field with the intensity of 0~0.8 V/cm was applied, and it was significantly higher than that of the control group （CK）. The contents of chlorophyll a and chlorophyll b, antioxidant enzyme activities （CAT, POD, SOD）, plant height, plant stem, root length, fresh weight, aboveground biomass and underground biomass all showed a trend of low promotion and high inhibition with the increase of electric field intensity. When the electric field intensity was 0.2~0.4 V/cm, the parameters of Astragalus adsurgens Pall. in different areas were improved to different degrees. However, when the electric field intensity was 0.8 V/cm, the parameters of seedlings were inhibited. Therefore, the electric field intensity of 0.2~0.4 V/cmcan stimulate the growth of Astragalus adsurgens Pall. and may be the best range of electric field intensity to strengthen the process of plant restoration to a certain extent, while the electric field intensity of 0.8 V/cmwill cause stress on the physiology and root soil of Astragalus adsurgens Pall. and make it unable to grow well.

Key words: Astragalus adsurgens Pall., direct-current electric field, physio-biochemica lindex, soil enzyme