Abstract: In order to screen the suitable concentration of exogenous DA-6,improve the ornamental value of Chrysanthemum,and promote its production and application,the effects of different concentrations of DA-6 on some physiological and morphological indexes of Chrysanthemumvariety were studied under field planting conditions.The results showed that among the four treatment concentrations of 10,20,40 and 80 mg·L^-1,the lower concentration of DA-6 sprayed on the whole plant could significantly improve the physiological indexes of chlorophyll,soluble protein and soluble sugar in the leaves of Chrysanthemumat bud stage and the morphological indexes of plant height and flower diameter at flowering stage,and the treatment of 20 mg·L^-1 had the best effect.40 mg·L^-1 treatment had no effect on the above indicators,while 80 mg·L^-1 treatment had inhibitory effect on the above indicators.Therefore,the appropriate concentration of DA-6 treatment can enhance the ornamental value of colorful.