1. The trash cans on the campus of Yunnan University are replaced with four-classified trash cans, and staff members are responsible for collecting the trash at regular intervals.

2. Then, the cleaning department of the university classifies and treats the garbage on the campus, and transports recyclable garbage, food waste, hazardous garbage and other garbage to the corresponding treatment places.

3. Finally, the relevant departments of the school will carry out harmless treatment or recycling of garbage.