This article discusses the possibility and mechanism of utilizing a local plant species, Pharammites communis, to control an invasive species Solidago Canadensis. We monitored specific ecological parameters of the two species in a complete growing season and also measured respectively the specific leaf weight and biomass. To calculate the competitiveness and the aggressiveness between the two species, the de Wit model was applied so as to predict the community succession pattern. We examined the reproduction strategy of the two species based on the comparison of the thousand-seed-weight and seed germination percentage. A seed culture with the tissue extraction of the two plants was conducted to observe the reciprocal allelopathic effect. In these experiments, we collected samples from a set of quadrates established in the construction wastelands in Minhang District located in southwest Shanghai. The experiment has suggested the following major findings. First, in the species mixed communities and at the end of the growing season, the average height, the coverage degree, the density and the important value of the P. communis, which approximated to the results obtained in P. communis mono-community, were all superior to those of S. canadensis. Second, there was no significant difference of the specific leaf weight and biomass per capita of P. communis between the species mixed communities and the P. communis mono-communities, while the two index of S. canadensis in the species mixed communities were significantly lower than those in the S. canadensis mono-communities. Third, the de Wit model showed the existence of competition and antagonism between P. communis and S.canadensis in the species mixed communities, and a significant inferiority of S. canadensis in aggressiveness compared to P. communis. The model also implied that P. communis would expel S. canadensis out of the quadrates as their competition progressed. Fourth, the thousand-seed-weight of P. communis was relatively higher than that of S. canadensis in their respective mono-communities, while the germination percentage was lower, which suggested an inferior distribution and reproduction capability of P. communis. And in the species mixed communities, the two data of the two species were significantly higher compared to those in their mono-communities, with a more noteworthy change of S. canadensis, which suggested that it enhanced its distribution and invasive capability more than P. communis does. Finally, S. canadensis extraction exerted an allelopathic effect on itself but imposed no effect on P. communis. Compared to the control group, the germination percentage of S. canadensis was higher at a low S. canadensis extraction concentration (12.5mg/mL), but it was lower at a higher S. canadensis extraction concentration. On the contrary, S. canadensis extraction of various concentrations exhibited no conspicuous allelopathic effect on P. communis. Based on the observations and results, we conclude that the local plant P. communis has the potential to control and prevent the expansion of the alien invasive plant S. canadensis in our study areas.