With the continuous progress and development of society, people's requirements for the quality of life are getting higher and higher. In this context, more and more people are paying attention to green and low-carbon building design. This article aims to introduce the issues that need to be paid attention to when applying computer simulation technology in the construction industry. First, this paper explains in detail the impact of using advanced means to optimize energy-saving design. Then, this paper analyzes and discusses how to combine computer simulation technology with green and low-carbon building design, and designs a green and low-carbon building design model based on computer simulation technology. In this paper, the simulation technology is tested and designed. The test results show that the number of calculations is between 4210 and 4986, the simulation efficiency is between 93% and 98%, and the throughput is between 31546 k and 39861 k. At the same time, the read and write speed of the computer is between 3% and 6%, which can guarantee the normal operation of the technology.