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The reflectometry is a common method used to measure the thickness of thin films.Using a conventional method,its measurable range is limited due to the low resolution of the current spectrometer embedded in the reflectometer.We present a simple method,using cubic spline interpolation to resample the spectrum with a high resolution,to extend the measurable transparent film thickness.A large measuring range up to 385μm in optical thickness is achieved with the commonly used system.The numerical calculation and experimental results demonstrate that using the FFT method combined with cubic spline interpolation resampling in reflectrometry,a simple,easy-to-operate,economic measuring system can be achieved with high measuring accuracy and replicability.