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Conventional planar low-pass filters often suffer from the problem of spurious passbands,though the design technology is mature. It presents a novel low-pass filter with broad stopband, which is a optimal structure realized by the way of separating specifications and ADS. Attenuation rate and stopband are designed respectively by using elliptic filter and butterworth filter before optimizing. The proposed low-pass filter has the advantage of design process and broad stopband. The insertion loss is less than 0.5 dB from DC to 3 GHz and S21 is less than -45 dB within the broad stopband from 4 GHz to 12 GHz.