The liquid-liquid equilibrium data of a ternary system water + acetone + dihydromyrcenol were measured at 358 K to 368 K under 0.8 MPa. The reliability of the experimental data was calculated by the Othmer-Tobias and Hand correlations. The nonrandom two-liquid model and the universal quasichemical model were used to correlate the tie-lines. The calculated results coincide with the experimental data very well.