Technological　innovation　Diffusion　in　industrial　cluster　is　different　from　the　technological　innovation　diffusion　with　many　features,　and　the　existed　methods　are　difficult　to　analyze　it.　Based　on　the　study　of　Bass　model　and　technological　diffusion　innovation,　this　paper　pointed　out　that　there　are　limitations　of　Bass　model　in　studying　technological　innovation　diffusion　in　industrial　cluster,　thus　expanded　and　established　the　modified　Bass　model　of　technology　innovation　diffusion　in　industrial　cluster.　Finally,　it　analyzed　the　simulation　results.　The　results　show　that　the　modified　Bass　model　is　more　reasonable　and　effective　than　Bass　model,　and　the　conclusion　is　more　realistic.　So　it　can　provide　theoretical　and　methodological　support　for　the　study　of　technology　innovation　diffusion　in　industrial　cluster.