A　power　law　turbulent　fluid　model　is　studied.　Using　a　semi-implicit　method　for　pressure-linked　equations　(SIMPLE),　the　numerical　computations　for　the　turbulent　flow　in　sudden　expand　channel　are　made.　The　simulation　results　show　that　the　changing　flow　tendency　of　power　law　turbulent　fluid　varies　with　the　different　flow　exponent,　which　means　that　the　flow　exponent　has　an　important　influence　on　turbulent　flow.　The　simulation　yields　good　results　when　compared　with　experiments.