Initially excavator is manual, from discovery to 2013 has been one hundred and thirty years, experienced a period bucket rotary excavator driven by steam to electric drives and internal combustion engine driven rotary excavator, hydraulic integration of the whole application progressive development of automatic hydraulic excavator. The first hydraulic excavator factory invented by the French Poclain success. Because the application of hydraulic technology, in the 1940s on a tractor equipped with a hydraulic backhoe excavators suspended. In 1951, the first fully hydraulic backhoe made in France Poclain (Poquelin) factory launched medium-sized second-hand excavator sales, which in the area of ??technological development excavators creating a new space, and early 1950s We have developed a mid-drag full-swing hydraulic excavators and crawler hydraulic excavator whole. Early trial is the use of aircraft hydraulic excavators and hydraulic machine technology and medium-sized second-hand excavator price, the lack of suitable excavator hydraulic components various working conditions, manufacturing quality is not stable enough, parts not complete. Since the 1960s, the hydraulic excavator into the promotion and vigorous stage of development, countries excavator factory and varieties increased rapidly, production soared. 1968--1970 years, the hydraulic excavator production accounted for 83% of total production of excavators, medium used excavators sale, has been close to 100%. Chinese excavator market average of 30% annually, the amount of one of the world's largest market. From the development perspective, Fujian medium used excavators, China is at the peak of the road transportation, energy and water conservancy, urban construction and other infrastructure construction, the excavator market demand increased year by year, the 2010 National excavator actual cumulative total sales the amount of more than 165,000 units, an increase of 74.5%. Import medium used excavators, used excavators Kim Ho, Sichuan medium used excavators by Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Shanghai Jin Hao Used Construction Machinery Co. (www.jinhaosh.cn) is the Shanghai Minhang District, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Kim Ho used excavators in leadership with the staff warmly welcome all inquiries negotiations to create jinhao used excavators better future.