Using luminol-H_2O_2-Co(Ⅱ) as chemiluminescent system,and Para-hydroxy benzyl alcohol, which was hydrolysated by gastrodin, as quencher, the later being oxidized at the expense of H_2O_2 resulting in reduced luminescent intensity, thus indirect determination of gastrodin was performed. This method is characteristic by its radidity,simplisity and High sensitivity.