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OFDM system can improve frequency band utility, decrease symbols interference caused by multi-path effect. It also can obtain reliable data transmission with high speed. The paper studies the channel estimation technique in a digital radio broadcast receiver based on OFDM-DRM. Due to the time and frequency selective variance of the channel encountered during OFDM transmission, the channel response has to be estimated in order to get exact data. This is done by using the known scattered pilots transmitted in OFDM symbols. OFDM based digital radio system adopts linear interpolation, windowed FFT interpolation and Wiener interpolation, in which Wiener interpolation is the best but requires a large quantity of computational consumption. The paper analyzes the Wiener algorithm..and simulates the MSE versus SNR for different Wiener filtering methods, and presents the flow charts of Wiener algorithm and realizes them in the computer.