Supply chain has become the key for companies competitiveness but has significant effect to environment including emission, pollution, and dangerous public health. It has been observed that industries already started to embrace integrating environmental thinking into supply chain management The aim of this study is to analyse the key factors of supply chain activity effect to environment. Object of this study is Maintenance, Repair and Overhaul (MRO) industry. The questionnaire were designed by collecting the criterias of environmental thinking from previous study. The criterias are Green Purchasing, Green Marketing and Service, Green Management System, Reverse Logistic, Green Practices, Green Outsourcing and Green Strategy Alternative. The Likert scale (1-5) was used to see the opinions of the respondents whether the proposed criteria and sub-criteria suitable for the implementation of environmental thinking.