在定性模拟算法（ＱＳＩＭ）中，时间被表示为由一些抽象的特异时点组成的集合，这些特异时点本身不含有任何具体的时域信息．由于缺乏时域信息，人们常常无法对带有时间延迟特性的系统进行仿真，因此必须充分利用一切可以利用的信息．根据区间约束传播思想，在ＱＳＩＭ算法基础上，本文提出了一种充分考虑时域信息的半定量方法（Ｓ－Ｑ），它是对ＱＳＩＭ算法的一个改进．本文还通过对离散经济系统ＣＯＢＷＥＢ模型的定性模拟，重点讨论了非线性包络函数条件下的模拟过程 In Qualitative Simulation Algorithm (QSIM), time is represented as a set of abstract time-specific points that do not themselves contain any specific time-domain information. Due to the lack of time-domain information, it is often not possible to simulate systems with time delay characteristics and therefore must take full advantage of all available information. According to the idea of ​​interval constraint propagation, based on the QSIM algorithm, a semi-quantitative method (S-Q) that fully considers the time-domain information is proposed in this paper. It is an improvement to the QSIM algorithm. In this paper, through the qualitative simulation of COBWEB model of discrete economic system, we mainly discuss the simulation process under the condition of nonlinear envelope function