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通过对小湾拱坝双心圆、三心圆、椭圆、抛物线、双曲线、对数螺线和二次曲线等７种方案的拱型优化研究，认为小湾拱坝的最优线型是二次曲线，该曲线由椭圆和双曲线混合组成，坝体积为６３０万ｍ３，比抛物线的最优体形（６８７．８万ｍ３）节省５７．８万ｍ３，值得认真研究；对数螺线、双心圆和三心圆的坝体体积均大于７００万ｍ３，可予以否定。
Through the arch optimization research on the seven schemes of Xiaowan arch dam such as double heart circle, three heart circles, ellipse, parabola, hyperbola, logarithmic spiral and quadratic curve, it is considered that the optimal linear type of Xiaowan arch dam is The curve consists of elliptic and hyperbola mixed, the dam volume is 6.3 million m3, which saves 578,000 m3 more than the optimal shape of the parabola (687.8 million m3), so it is worth studying carefully. The logarithmic spiral, Double heart and three heart of the dam body volume are greater than 7 million m3, can be denied.