Low-carbon building is within building’s lifecycle, through carbon source reduction and carbon sink addition during the process of plan, design, construction, operation, demolition and recycle to achieve the optimization of building lifecycle carbon performance. This article takes the case of Low-carbon Building Evaluation Standard of Chongqing to briefly introduce low-carbon building evaluation indexes, also by comparing with the Green Building Evaluation Standard of Chongqing to identify the two index system’s differences and similarities. Through comparison analysis it is discovered that green building evaluation index system focus more on basic resource and energy consumption status as well as the environment quality delivered, where as low-carbon building evaluation index system put more emphasis on detailed resource and energy consumption status and carbon performance.