用鞣酸为显示剂，采用多波长线性回归－分光光度法同时测定催化裂化原料油中的铁和钒，方法简单，选择性好，不需要任何掩蔽和分离，可直接进行测定。对合成样品进行分析，铁的相对标准偏差≤２．４４％，相对误差≤２．６０％；钒的相对标准偏差≤４．６５％，相对误差≤±１．３２％。对实际样品进行分析并与其它方法进行对照试验，结果良好。 Using tannic acid as the display agent, simultaneous determination of iron and vanadium in the catalytic cracking feedstock oil by multiwavelength linear regression spectrophotometry is simple, selective and does not require any masking and separation and can be directly determined. The relative standard deviations of iron ≤2.44%, relative error ≤2.60%; relative standard deviation of vanadium ≤4.65%, relative error ≤ ± 1.32%. The actual samples were analyzed and compared with other methods and the results were good.