“价值”一词有多种涵义。价值工程中的价值概念的内涵属于技术经济学范畴,具有多种特性。1.空间性.是指价值在一定条件下而存在和所具有的相对环境。环境包括任务环境、作用对象环境、资源环境、技术环境、需求环境及社会环境等。无一定的具体环境条件,价值不能存在。如不同的技术环境条件,单位消耗所实现的功能效用不等,因而其价值也不相同。2.时间性.是指价值受时间所制约,并随时间的推移而变化,表现为一定的时机性。特别是在当代新技术革命形势下.价值的时间性显得更为突 The word “value” has many meanings. The connotation of value concept in value engineering belongs to the category of technical economics and has many characteristics. 1. Spatial. Refers to the value under certain conditions exist and have the relative environment. Environment includes the mission environment, the role of the target environment, resource environment, technology environment, demand environment and social environment. No specific environmental conditions, the value can not exist. As different technical environmental conditions, unit consumption function to achieve the effectiveness of different, so its value is not the same. 2. Timeliness refers to the value of the time constraints, and changes over time, showing a certain timing. Especially in the current situation of new technological revolution, the temporal nature of value is even more pronounced