角动量是力学中的重要概念.本文建立了经典力学中质点系的轨道角动量和自转角动量的概念，使经典力学的理论体系更加完备，并通过几个例子阐述其应用意义.在经典力学中引入轨道角动量和自转角动量的概念，能够使学生加深对角动量的理解.

Angular momentum is an important concept in mechanics. In this paper, the concepts of orbit angular momentum and rotation momentum of a system of mass points are established in classical mechanics to make the theory more complete. The application significance is illustrated by several examples. Introducing orbit angular momentum and rotation momentum into classical mechanics can help students deepen their understanding of angular momentum, establish a relationship with orbit and spin angular momentum in quantum mechanics, and deeply understand the similarities and differences between spin angular momentum in classical and quantum mechanics.