Many rivers in our country need further development and utilization .Using the advanced SMS simulation software of surface flow field as a platform , the steps and process of the numerical simulation for fixed boundary flow field are dis -cussed in the this paper , taking Chenjiaxi section of Jinsha River as the research object .Compared with the measured val-ue, the calculation errors in water level , water depth and flow velocity from the most monitoring points of the established model are below 5%.It proves that the mathematical model for Jinsha River is of high computational accuracy , providing reference for fixed boundary flow research .%以先进的地表水流流场模拟软件SMS为平台，以金沙江陈家溪河段为研究对象，探讨固定边界水流流场数值模拟的步骤与过程，通过与实测值的对比发现，所建模型大部分监测点的水位、水深、流速的计算误差都在5％以下，表明此金沙江河段数学模型计算精度较高，可为固定边界水流研究提供借借鉴。
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