Based on the life cycle assessment method, the entire life cycle of polybutylene terephthalate resin products is considered, and resource consumption at each stage is analyzed in depth from product design, raw material acquisition, product production, product use, and post-waste recycling. , ecological environment, human health factors, select evaluable indicators at different stages to form an evaluation indicator system. According to the characteristics of polybutylene terephthalate resin products, environmental impact categories with large impact, high social concern, and clearly required by national laws or policies are selected, and resource attributes, pollutant emissions, etc. are selected for life cycle assessment.