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We present a new three-dimensional potential energy surfaces for Ne-CS2.The Q3normal mode for the V3 antisymmetric stretching vibration of the CS2 molecule is involved in theconstruction of the PES with five PODVR grid points.The potential energies were calculatedusing the supermolecular method at the [CCSD(T)] level,using aug-cc-pVQZ basis set plusmidpoint bond functions.Two vibrationally averaged potentials with CS2 at both the ground(υ=0)and the first excited(υ=1)υ3vibrational states were generated from the integration ofthe three-dimensional potential over the Q3coordinate.The global minimum has a T-shapedconfiguration and two equivalent local minima are of linear geometry.The radial DVR/angularFBR method and the Lanczos algorithm were applied to calculate the rovibrational energy levelsfor two isotopomers20Ne-CS2and22Ne-CS2.The calculated band origin shifts of the twoisotopomers(0.1810 and 0.1819 cm-1)are very close to the observed values1(0.1804 and 0.1827cm-1),respectively.Excellent agreement between the calculated and observed infrared transitionfrequencies and relative intensities demonstrates the high quality of the new averaged PES.