Due to industrialization, urbanization and population explosion, there have been severe ecological problems for the urban agglomeration area in the Great Pearl River Delta. The ecological security issue becomes the major restricting factor for building a moderately prosperous society in the Great Pearl River Delta, jeopardizing the sustainable development of local socio-economic activities. The project of "Development of ecological security protection techniques for the urban agglomeration area in the Great Pearl River Delta" aims to meet the requirements of vulnerable ecosystem restoration and protection, and conduct comprehensive research for the integrated ecosystem in the urban agglomeration area of the Great Pearl River Delta. The study will be conducted based on the complex interactions, compact spatial organization, and intimate economic relationships for ecosystem in the urban agglomeration area. The topics include (1) ecological base accounting and health evaluation, (2) metropolitan metabolism simulation and ecological risk assessment, (3) network design for ecological security and protection of ecological security, (4) landscape reconstruction and ecological space restoration, (5) restoration of damaged habitats and protection of ecological security for coastal urban agglomeration area, (6) integration of ecological security protection techniques, development of supervisory platform and demonstration projects. This project can provide theory basis, technique system and demonstration for characterization, evaluation and regulation of ecological problems in the urban agglomeration area of the Great Pearl River Delta. The outcomes have significant socio-economic and ecological benefits.