The general form of Ampere circuital theorem is deduced from the Biot-Savart law using superposition of magnetic fields.Discussions are given.

• 从毕奥-萨伐尔定律出发，应用立体角的知识和磁场叠加原理，推导出一般情况下的安培环路定理，并进一步讨论了电流正负号等问题.