Some strategic environmental assessment (SEA) pilot cases in China strive to integrate environmental issues into the planning from the beginning. One of them is the SEA for development strategy of Tianjin Binhai New Area. The SEA adopted an interactive assessment mode with the decision-making process and predicted the environmental impacts of the development strategy on land resource, water resource, energy, surface water, atmospheric environment, and ecosystem of land area and offshore area. The future development strategy of circular economy and low-carbon economy in Tianjin Binhai New Area was also analyzed. Finally, experience from the SEA case was discussed. The case study shows that support from non-environmental agencies, early integration of SEA process and planning process, interactive assessment mode, and sensible environmental protection strategy facilitate the integration of environment into decision-making.