Abstract: Based on lattice Boltzmann method(LBM), the process of droplets merging and bouncing at the top of inclined plane with wetting gradient was simulated. The effects of wetting gradient, wettability at the top of inclined plane, droplet size and Bond number on droplet merging and bouncing process were investigated. The calculation results show that the two droplets can bounce when merged under the action of non-equilibrium tension on a hydrophobic gradient slope. Both the droplet fusion velocity and the maximum jump height increase with the increase of wetting gradient. The maximum droplet jump height decreases with the increase of the wettability of the inclined surface. There is an optimal droplet size that optimizes the maximum jump height. The larger the Bond number, the smaller the maximum droplet jump height.