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The morphology of ECG signal has been used for recognizing much variability's of heart activity, so it is very important to get the parameters of ECG signal clear without noise. In order to support clinical decision-making, reasoning tool to the ECG signal must be clearly represented and filtered, to remove out all noises and artifacts from the signal. ECG signal is one of the bio-signals that is considered as a non-stationary signal and needs a hard work to denoising. This paper described about denoising the ECG waveform by applying the different filters like band-stop filter, low pass filter, high pass filter and average digital filter. The MATLAB simulation result is showed the different waveform images after applying the different filters. Based on the filter characteristic the corresponding noises are removed and consolidate table also is available in this paper.