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green space to drain that: (1), to drain the slopes meet the design requirements, pipe elevation deviation shalments, pipe elevation deviation shall not exceed ± 10MM. (2), pipe connections require socket or confinement of the interfaces should be straight, ring-shaped gap should be uniform. Gray should be dense, full, with interface surfaces should be smooth, uninterrupted and cracks and hollowing phenomenon. (3), drainage pipeline depth should according to water wells and linking the slope of the pipe and the external loads identified, overburden depth not less than 30CM. C when using external drainage, green water, open ditch near the bottom shall be not less than the high water level of water. Second, ensure good maintenance management of organizational measures 1, organizational measures and technical measures (1) the Organization establishing on-site management of the guarantee system, established based on the maintenance lead maintenance quality management assurance system, implementation of project quality management by objective. According to the characteristics of this conservation project, clear criteria for departments working duties, forming an effective quality assurance system. (2) the establishment of a complete system of quality inspection and supervision to ensure: group self-inspection, mutual, head of reinspection, lead check and unit leadershi