Abstract: The aim of this study was to observe silage prosperities of cicer milkvetch and to determine fermentation quality and nutritional content of citer milkvetch silage. The fresh and wilted citer milkvetch during flowering stage were bagged for fermentation with formic acid （6 mL/kg） or sucrose （2%） for 360 d. The CK was also set up. After fermentation of citer milkvetch, wilting reduced the pH value and lactic acid content （P〈0.05） and decreased the ammonia nitrogen content significantly （P〈0.01）. Supplementation of formic acid or sucrose reduced the pH value and ammonia nitrogen content significantly （P〈0.01）, increased the lactic acid content （P 〈0.05） and reduced the acid content （P〈0.05）. Wilting or supplementation of acid or sucrose had no significant effect on nutrient content （NDF, ADF, Ash and EE）, dry matter recovery nitrate content and nitrite content of citer milkvetch silage. Supplementation of formic acid increased CP content significantly （P〈0.05）. The nitrate content decreased obviously after fermentation.