The demonstration project for the comprehensive improvement of living environment in Guangdong Province - Whole-county (Including Small Towns) Domestic Sewage Treatment of the Yunan County PPP Project - is the first whole-county domestic sewage treatment PPP project in Guangdong Province, with an investment of RMB 500 million. It is the prelude of People's Government of Guangdong Province to create a "beautiful village", which has attracted the attention of the society.