A new method is proposed which makes it possible to produce flattened irradiance distribution by incoherent combination of cosh Gaussian beams with different parameters. Based on the Collins integral formula, the resulting irradiance distribution is derived and the corresponding beam qualities in terms of M2 factor and kurtosis parameter are given. The numerical examples illustrate that a flattened intensity distribution of the resulting beam can be obtained in the near filed if appropriate parameters are chosen. Compared with the coherent combination of the Hermite-Gaussian (HG) beams, this new method leads to better beam quality and can be more easily realized experimentally resulting from in-phase-free requirement.