本文试图从功和能的角度分析抽水井的能量转化。抽水过程是通过抽水设备输入一定能量，克服井管内外的摩阻，把水由地下提升到地表的作功过程。抽水设备输入的有用功是决定水井出水量分配和产生能量转化，即引起水头下降的根本原因。按能量守恒定律，抽水设备输出的有用功，一部分消耗于井管内的阻力损失；另一部分传递到井底推动地下水向井汇流。 This article attempts to analyze the energy conversion of pumping wells from the perspective of power and energy. Pumping process is through the pumping equipment to enter a certain amount of energy to overcome the well inside and outside the friction, the water from the ground to the surface of the work process. Pumping equipment input useful work is to determine the water well water distribution and produce energy conversion, that is caused by the root cause of head drop. According to the law of conservation of energy, the useful output from the pumping equipment is partly consumed by the loss of resistance in the well pipe; the other part is transmitted to the bottom of the well to push underground water to confluence.