填海造地对深圳市具有深远的可持续发展意义，而增加调蓄水库库容不仅具有现实的经济意义，而且具有巨大的环境和生态意义，扩库填海是满足此两个意义的最优选择。分别从生态、环境、景观、经济、社会、城市供水安全等角度论证了扩库填海的必要性和合理性。

Sea filling to make land in Shenzhen city has profound significance of sustainable development. But the increase of the storage capacity and regulation of water reservoir not only has economic significance, but also has huge environmental and ecological significance. Sea filling and reservoir expansion are the two most superior choices to satisfy these significances. This research proved the rationality of sea filling and reservoir expansion from the angles of ecology, landscape, economy, society, water supply security in city respectively.