An experimental device for measuring optical activity and concentration of glucose and sucrosesolutions was designed based on the PASCO platform.The experimental optical path layout could be observedthrough discrete devices such as laser, polarizer and light intensity sensor, which helped students to deepentheir understanding of the principle of optical activity solution measurement.By connecting the rotation sensorand light intensity sensor to the computer, the optical rotation and light intensity extremes can be accuratelyocated and the measured values can be read ,avoiding the possible position imprecision and reading deviationcaused by manual operation.Compared with the measurement of gyroscope, the results show that the discretedevice using PASCO platform can effectively reduce the error.On this basis,the experimental device can beextended to real-time on-line measurement and monitoring of flowing optically active liquid concentration.