Abstract: In order to make full use of the resources of Solidago canadensis, the nutrient composition of S.canadensis in different growing seasons were determined and analyzed. The moisture content was determined by gravimetric method, and the ash content was measured by high-temperature furnace burning. The soluble sugar content was measured using anthrone colorimetry. And the fructose in sucrose was determined by resocin colorimetry after samples were hot destroyed. The crude fiber content was determined, and the samples were treated with sulfuric acid, alkali, alcohol, and ether. At the same time, the contents of crude protein were determined by coomassie brilliant blue. The results showed that the moisture content declined with the change of season and the moisture content of leaves of S. canadensis was higher than that of stems and root in early spring. The moisture content of stems of S. canadensis was higher than that of roots from March to June, and the moisture content of roots was higher than that of stems from June to October. In addition, the ash content of leaves was higher than that of the stems and roots, however it did not change significantly to the seasonal changes. The ash content of stems was higher than that of roots before May, but the ash content of stems was significantly lower than that of the roots after June. The soluble sugar content of stems was higher during March and April, and the total sugar content of root was obviously higher than that of stem and leaves from May to November. Sucrose and the total soluble sugar content presented a similar seasonal variation, indicating that the sucrose content of roots significantly increased in November. The crude fiber content increased with the seasons change, and the crude fiber content of stems was higher than that of the roots and leaves. With the change of seasons, the protein content decreased, and the protein content of leaves was higher than that of stems and roots.