采用紫外分光光度法测定了注射用头孢唑啉钠含量．头孢唑啉钠浓度为１０～３０μｇ／ｍＬ时呈很好的线性关系，回归方程：Ａ＝００２８９Ｃ－０００７４；ｒ＝０９９９９（ｎ＝５），平均回收率为９９８％，ＲＳＤ＝０２％． The content of cefazolin sodium for injection was determined by ultraviolet spectrophotometry. Cefazolin sodium concentration of 10 ~ 30μg / mL showed a good linear relationship, the regression equation: A = 0289C-00074; r = 09999 (n = 5), the average recovery was 998 %, RSD = 0.2%.