Abstract: Nowadays,the methods of sub-Nyquist sampling studies are the modulated wideband converter and multi-coset sampling and both of which are sampling methods used to acquire continuous-time signals with sparse spectra.However,multi-coset sampling is a non-uniform sub-Nyquist method and the modulated wideband converter is a uniform one.The modulated wideband converter and multi-coset sampling with applications in the sparse multi-band signals are discussed from sampling methods,the spectrum support recovery,signal reconstruction and complexity.The experimental results showed that,at the same average sampling rate,the modulated wideband converter can be implemented by using hardware with an allowable error,and the multi-coset sampling needs a precise time-delay and is difficult to implement by using hardware,although the MSE of the modulated wideband converter is larger than the multi-coset sampling.