The recoil angle of electron in Compton scattering is incorrect in some text books, and the right sketching of Compton scattering is presented.

• 摘要指出了某些教材中康普顿散射示意图画法的不妥之处，并严格推导了康普顿散射中反冲电子的散射角，给出了正确的康普顿散射示意图。