Lanshen has been focusing on EPC for sewage treatment for a long time, and has accumulated rich experience in construction, installation and operation. It has comprehensive strength to ensure project quality and promote project construction schedule. At the same time, it first proposed the "O +EPC" model, changing the traditional "heavy engineering, light operation" thinking, using operation as the starting point, using the Internet of Things technology to achieve full life cycle management covering project design, procurement, construction, operation and maintenance, let sewage treatment enter Effect era.