We　reported　a　new　approach　for　obtaining　proper　gain　coefficient　and　dithering　amplitude　of　multi-dithering　algorithm　in　coherent　beam　combination　via　threshold-testing　technique.　Through　this　approach,　two　parameters　can　be　set　based　on　obtaining　threshold　with　actual　signal　intensity　varying.　To　clarify　the　new　method,　we　demonstrated　the　coherent　beam　combination　of　two　channels　experimentally,　which　results　coincided　well　with　the　simulations.　The　experimental　results　indicate　that　this　method　is　an　effective　way　to　improve　the　performance　of　coherent　beam　combination　systems.