根据牛顿阻力公式和能量方程，初步研究了胸墙流速系数和大孔口淹没堰流流量的计算方法，所得结果得到水槽模型试验资料的检验，并与按孔流方法计算的结果做了比较，获得一些有益的认识． According to Newton’s resistance formula and energy equation, the calculation method of chest wall flow velocity coefficient and large orifice submerged weir flow were preliminarily studied. The obtained results were tested by the model test data of the sink and compared with the results calculated by hole flow method. Some useful understanding.