By applying the configuration-bias vaporization method for the simulation of hquid-hquid equilibria based on lattice model

the liquid-liquid equilibria of three ternary systems with the specified molecular parameters（r_1=1

r_2＝4

r_3=8

ε_(12)=0.333

ε_(13)= 0.556

ε_(23)=00）

（r_1＝1

r_2＝4

r_3=l6

ε_(12)＝0.25

ε_(l3)＝0.50

ε_(23)=-0.10）and（r_1＝1

r_2＝4

r_3＝32

ε_(l2)＝0.25

ε_(13)＝0.50

ε_(23)＝-0.10）

respectively

are obtained.Comparisons between the simulation results and those calcu1ated by Flory-Huggins theory

Freed theory and Hu et els model for the Polymer solution are made.It is shown that Flory-Huggins theory have large deviation from simulated results

while Freed theory and Hu et als model gives much better results．