To select the potential native plants for replacement control of the invasive Ageratina adenorphora, competition relationships between three native plants (Choerospondias axillaris, Desmodium heterocarponand, and Setaria viridis) and A. adenophora were measured by the competitive parameter relative yield (RY) and competitive aggressivity coefficient (A) in a common garden experiment. In addition, effects of the activated carbon (AC) and fungicide (FC) on the competition of the native plants with A. adenophora were also studied, aiming to explore a method of improving the replacement control and ecological restoration effects. The results showed that under the condition without AC or FC,when A. adenophora was grown with C. axillaris, the total biomass of A. adenophora mixculture was higher significantly than that in monoculture (P<0.05), and the competitive parameter RY and A of A. adenophora were significantly greater than 1 and 0, respectively (P<0.05); When A. adenophora was grown with D. heterocarpon or S. viridis, the shoot length and total biomass of A. adenophora mixculture were both less than those in monoculture, and the competitive parameter RY and A were significantly less than 1 and 0, respectively (P<0.05). It indicated that the competitive ability of A. adenophora was greater than that of the native plant C. axillaris but was less than that of the other two native plants D. heterocarpon and S. viridis. The two native plants D. heterocarpon and S. viridis could be promising potential replacement control agents for A. adenophora. Compared with the treatment without AC or FC, when A. adenophora was grown with C. axillaris, AC, FC and AC+FC treatments increased the root-shoot ratio but decreased aboveground biomass ratio of A. adenophora, and decreased the total biomass of C. axillaris (P<0.05). When A. adenophora was grown with D.heterocarpon, AC and AC+FC treatments increased significantly the shoot length and total biomass of D. heterocarpon, and FC treatment increased significantly the shoot length of A. adenophora (P<0.05). When A. adenophora was grown with S. viridis, AC and AC+FC treatments increased the root-shoot ratio but decreased the aboveground biomass ratio of A. adenophora, FC treatment had no significant effect on each growth variable of the two plant species (P>0.05). These results showed that addition of AC or FC had different effects on different plant species when A. adenophora competed with different native plants. Therefore, it depends on the specific objective species whether AC or FC could be used in replacement control for A. adenophora.