The main research aim was to investigate the effect High Performance Work Systems on Environmental Organizational Citizenship Behaviors. to achieve this goal three research hypotheses have been developed, and the analytical method was used to derive research hypotheses. It leads to improving the environmental performance of the applied company, which is Telecom Egypt company, and for the purpose of collecting primary data, a survey form was prepared, and a stratified random sample was selected from the research community, where it was distributed to a sample of(400)individuals working in the different sectors of Telecom Egypt in the main center in Cairo Governorate. The response rate in the research sample was(349)equivalent to (87.25%), and data analysis and testing the validity of hypotheses were relied on the statistical packages program (SPSS 25) and the (AMOS 25) program. After analyzing the data, the research concluded that the overall scale of high-performance work systems has a direct and significant effect on the overall scale of environmental organizational citizenship behaviors. The research concluded with a number of recommendations, which are to enhance interest in Eco-Initiative by including them in the annual evaluation of workers, such as adding a paragraph on the extent to which workers contribute to maintaining the work environment in the annual evaluation form, and providing opportunities to involve workers in environmental events, projects and Eco-Initiatives and motivating them morally and materially. The performance of environmental behaviors in the company, and the inclusion of behaviors that indicate Eco-Helping in performance evaluation models