Domestic rain garden cases refer to the examples of rain gardens implemented in China. Rain gardens are designed landscapes that help manage stormwater runoff by allowing it to infiltrate into the ground, reducing the volume of runoff entering storm drains. These gardens are often planted with native vegetation that can withstand varying water levels. In China, there are various case studies showcasing the integration of rain gardens into urban areas, residential complexes, and parks to enhance water quality, conserve water, and mitigate urban heat island effects.