ＭＥＳＯＲＡＤ计算机程序由美国核管会委托太平洋西北实验室研制，并得到美国核管会认可，用于核设施事故后早期辐射剂量计算，其计算结果为应急响应提供科学的决策依据。本文主要介绍了该程序的设计目的、功能、特点、物理模型以及应用前景。 The MESORAD computer program was commissioned by the NRC to be developed by the Pacific Northwest Laboratory and approved by the US Nuclear Regulatory Commission for early radiation dose calculation after a nuclear facility accident. The calculation results provide scientific decision-making basis for emergency response. This article mainly introduces the design purpose, the function, the characteristic, the physical model and the application prospect of the program.