By summarizing the main problems about the traditional rainwater drainage pattern in China, the main idea and excellences of low impact development (LID) city rainwater management pattern are introduced. Four aspects about the LID pattern extension strategy in China are put forward, which include innovative extension, innovation development, diversity application and digital analogy. According to the strategy, traditional extension pattern called “from point to area” can be changed. LID would be applied to urban reconstruction, rural area development and water environment management. Digital analogy technology should be given more attention because it can enhance the scientific and feasible of the LID pattern.