This is a micro architecture design about water reusing.Taiwan is the 18 th country which is lack of water in the world. And Yunlin city is suffered by the land subsidence.We hope to solve the problem by reusing rain from the high-speed rail track, farming wastewater and flood setention ponds. Furthermore, to create a educational playground and help regulate climate. Our design is to build 22 of purifying micro architecture along the high-speed rail track to influence the condition of land subsidence beside the line of high-speed rail track.