Abstract: With an ethanol-cyclohexane-water system to carry out a ternary liquid phase equilibrium determination experiment for undergraduate students, this paper analyses the feasibility and rationality of the experiment.Combined with the major experiment characteristics, many experimental details are intergated considered such as experimental equipment building, analysing methods et al to optimizate the experimental programme .Under different temperatures, we determine the solubility curve and balance connection line of ethanol-cyclohexane-water ternary system to ensure the optimal experimental condition.The results show that when the reaction temperature at 20℃, the experimental phenomenon in the reaction vessel can be observated clearly, as well as a stable experimental results can be obtained, By later analysing and discussion of the experimental data, students can learn the calculation method of the distribution coefficient K, the selectivity coefficient β, and the graphical plotting method of the Origin software.