The design for water body ecological restoration in Shanghai Luxun Park is a re-practice of the micro-transformation of the park's ecological environment in the urban context. Aiming at improving the water quality, renovating the park landscape, improving the human settlement environment and restoring the ecological balance, the design team innovated an "underwater forest" system to create a self-circulating micro-ecology to achieve long-term water purification effect with low maintenance cost and high operation efficiency.