本文简介了目前三维放射治疗的发展情况，着重介绍了三维适形放射治疗、动态多叶光阑、调强放射治疗、三维放疗计划系统常用工具、计算机优化方法和逆向治疗计划问题、以及ＣＴ模拟定位机的最新进展，指出三维放射治疗的发展趋势，面临的问题和研究方向。 This article introduces the current development of three-dimensional radiation therapy, focusing on three-dimensional conformal radiotherapy, dynamic multi-leaf diaphragm, intensity modulated radiation therapy, three-dimensional radiotherapy planning system commonly used tools, computer optimization methods and reverse treatment planning issues, and CT simulation The latest development of the positioning machine, point out the development trend of the three-dimensional radiotherapy, the problems and the research direction.