In order to improve the service life of materials, the influence mechanism of lap ratio on the performance of multi-channel laser cladding layer was investigated, and the key problem restricting the wide application of laser cladding technology in the industrial field-cladding area was solved. In this paper, based on SYSWELD software platform and 3D Gaussian heat source distribution model, three lap coatings of NiCrCoAlY alloy were prepared by laser cladding on the surface of TC4 titanium alloy. The effects of different lap rates on the temperature field and thermal cycle characteristics of the three lap coatings were discussed. Combined with experiments, the optimum bonding ratio of laser cladding NiCrCoAlY coating on TC4 titanium alloy was obtained. Results show that the optimal parameter is the lap rate of 30%. With the increase of lap ratio, the area of secondary melting and phase transformation of the first two cladding layers increases, and the cladding layer surface is uneven and prone to crack.