Objective: To establish a rapid determination of total phenols in Dendrobii Officinalis Caulis. Method: Folin-Ciocalteu Colorimetry was adopted to determine the content of total phenols in Dendrobii Officinalis Caulis by taking ferulic acid as a reference.Single factor tests were adopted to screen chromogenic conditions,such as detection wavelength,chromogenic time and temperature,et al;With the content of total phenols as index,effects of ethanol concentration,solid-liquid ratio,extraction time and times on extraction technology of total phe...