关键词: 需求描述语言, 软件行为, 需求工程, 需求建模方法

Abstract: In this paper，a new software behavior oriented requirements modeling methodology and a behavior description language （BDL） are presented.The design and realization of the requirements description language are discussed.By using the modeling methodology，effective behaviors of the target system can be extracted from the user’s requirements information，and then the behavior model of target system can be built.This modeling methodology can help the software users and developers to understand the behaviors of the target system more thoroughly，and can establish a foundation for automatically checking some characters of the target system.

Key words: requirements description language, software behavior, requirements engineering, modeling methodology