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For the problem that poor performance or high complexity of the traditional DVB-T system channel estimation algorithm, in order to improve the overall performance of channel estimation algorithm, an improved DVB-T channel estimation method is proposed in this paper. Firstly, using the least squares to estimate frequency response value of scattered pilots; then,using continuous pilot to estimate the signal-to-noise ratio; Finally, compared with the preset threshold, if the estimated Signal-Noise ratio is smaller, firstly through Kalman filtering, then using Gaussian interpolation in time-frequency direction to get all frequency response values, or interpolating directly in the time domain and the frequency domain. This method close the Kalman filtering process when the channel condition is good, thus effectively reducing frequency of filter and improving the overall algorithm. The simulation results show that on the maintain of the operation speed,the proposed method can improve the performance of the system and reduce the interference when the noise is large.