Multi-layered thin films of ZnS/ Na3AIF6/ZnS/Cr were deposited on glass substrate by evaporation process. ZnS and Na3AIF6 were selected as high and low refractive index material, and additionally Cr was chosen as mid reflective layer respectively. The multi-layered thin films were prepared in terms of different optical thickness and different staking sequence and layers. The optical properties were systematically characterized with different optical thickness of Na3AIF6 especially 0.25λ and 0.5λ. In order to expect the experimental result, the simulation program, the Essential Macleod Program(EMP) was adopted. Based on the results taken by spectrophotometer at viewing angle 45°, the ZnS/ Na3AIF6/ZnS/Cr multi-layered thin film shows purple colour range in 0.25λ， bluish green in 0.5λ, red purple in 0.75λ, and purple in 0.75λ respectively.