Based on a case study of Guangzhou Haizhu eco-city planning, this paper explores the methods of achieving the goals of low-carbon city planning both in master plan and regulatory plan, and proposes the concept of low-carbon city index system which is compatible with the traditional urban planning system. The compatible low-carbon city index system is hierarchically established in order to match the hierarchy of traditional urban planning system. Also, the compatible low-carbon city index system is practical in each process of urban planning, city management, project construction and operation and the approval authority of each low-carbon city index system is clearly defined. Finally, this paper concluded that the compatible low-carbon city index system is highly related to the traditional urban planning system and can be easily implemented.