Changchai adheres to the market as the center, constantly explores new marketing ideas to adapt to the market development, implements the five-in-one management method of "complete machine sales, spare parts supply, three-guarantee service, capital withdrawal and information feedback", and has built a nationwide sales service network, with 5 sales business units, 25 sales service centers and more than 700 specially invited maintenance stations, and service outlets all over urban and rural areas. It is a relatively complete and wide-covering sales service network in the small and medium-sized power diesel engine industry in China. Through the unified command of "Changchai Customer Call Center" at the company headquarters, with the service tenet of "proactive, fast, convenient and accurate", we provide customers with high-quality pre-sales, in-sales and after-sales services.