The method for measuring refractive index of micro-quantity liquid within a glass capillary has a promising application in virtue of minimal sample requirement and confinement of liquid in a capillary. In order to improve the measurement uncertainty and convenience, the traditional eyepiece is substituted by a CCD-containing electronic eyepiece. In addition, an electric precision displacement stage is used instead of the traditional manual precision displacement stage. Refractive indices of solutions of glycol with various concentrations are measured by the new measurement system in our experiment. The measurement uncertainty reaches to ±0.0002 and the required liquid quantity is less than 0.002 mL for a single measurement. In the method for measuring refractive index of micro-quantity liquid within a glass capillary, the introduction of electronic eyepiece and electric displacement stage improves the uncertainty of the measurement.