To explore the way of agricultural recycling, the used sewage-treating ceramsite was first observed by Scanning electron microscope(SEM) and X-ray diffraction(XRD) analysis. Then the ceramsite (350 g) was mixed with soil (1.2 kg) and applied on pot cultivation of two kinds of maize, referred as treatment T1 and T2, at the same time, the two kinds of maize cultivated without ceramsite were served as control group, namely, CK2 and CK2 to study the effect of ceramsite on soil amelioration and on growth of maize, and the underlying mechanisms were also explored. The results showed that after treating the sewage, alkaline substance was found in ceramsite and phosphorite was detected on the surface of ceramsite. Soil pH, available phosphorus and total phosphorus in soil were obviously enhanced. The available phosphorus and total phosphorus in T1 respectively increased 27.9% and 17.7%, compared to CK1, and those in T2 respectively increased 27.3% and 14.3%, compared to CK2. Maize growth under T1 and T2 treatments were all better than that under CK1 and CK2. Compared to CK1 and CK2, maize height increased 14.5% and 23.6%, stem diameter increased 16.2% and 24.5%, leaf area increased 75.9% and 64.6% and length of root increased 17.2% and 24.1% correspondingly in T1 and T2. In addition, accumulation of dry matter in the plant was also promoted in T1 and T2. These results suggest used sewage-treating ceramsite could be applied on soil amelioration, which would be an important and prosperous way for disposing the ceramsite after municipal sewage-treating.