The theory of medical microtron is introduced.The theory of medical runway microtron is expressed and its characteristics are compared with electron linear accelerator.

着重介绍了电子回旋加速器原理，重点介绍了跑道式电子回旋加速器的工作原理，并对电子回旋加速器和电子直线加速器的特点进行了比较。