Small and medium-sized rivers of mountainous have the characteristics of large slope and a lot of hydraulic structures,, which leads to more difficult on the water surface calculation than the plain river,.Normal water surface calculated program is diffi-cult to adapt to supercritical flow and the calculation of hydraulic structures.General water surface calculation program under the condition of supercritical flow and the hydraulic structures is more prone to mutation,, sometimes must be segmented calculated,. The calculation accuracy is poorer,, and operation is more complicated.The comprehensive regulation and administration of tiec-hang river project is used as example, water surface elevation has been calculated and compared with other application results through the establishment of hec-ras one-dimensional model.As a result, hec-ras model has advantages in water surface calcu-lation of small and medium-sized rivers of mountainous area.%山区中小河流具有坡降大、水工建筑物多、水流急的特点，在水面线推算上相比平原区河流难度较大。常规的水面线方法在急流及多水工建筑物情况下容易出现突变，需分段推求水面线，计算精度较差。该文选定铁场河综合整治工程案例，建立HEC－RAS一维模型推算铁场河干流水面线，并与常规的水面线方法结果对比，分析HEC－RAS模型在山区中小河流水面线推算中的优点。
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