Excavator refers to the earth-moving machinery, digging material from where is higher or lower than bearing surface by the bucket, then deliver into a transport vehicle or unloaded upon the material pile. The material excavated is soil, coal, sand, and the pre-loose soil and rocks. In recent years, from the perspective of the development of construction machinery, excavators developed relatively faster, as one of the most important construction machinery, it is crucial to choose the excavator with the proper model.
 
It has been 130 years history since the advent of the first hand excavator, during which they experienced the development process from the steam-driven rotary excavator bucket to the power-driven and internal combustion engine-driven rotary excavator, then automatic hydraulic excavator with application integration technology step by step.

Due to the application of the hydraulic technology, in the 40s of 20th century, there was the tractor equipped with a suspended hydraulic backhoe excavator, in the early and mid 50s of the 20th century, have developed a full-drag type rotary hydraulic excavators and crawler-type full – hydraulic excavators. The initial trial production of hydraulic excavators adopt the hydraulic technology of aircraft and machine tools, due to the lack of hydraulic components which is suitable for various working conditions, the manufacturing quality of excavators is not stable enough, and the supporting parts are not complete. From the 60s of 20th century, the hydraulic excavator enters into the stage the promotion and vigorous development, and the varieties of the excavators, also the excavators manufacturers increase dramatically. During the years of 1968-1970, hydraulic excavator production accounts for 83% of the total output, currently is close to 100%.