odern hydraulic excavator hydraulic system of the paper is less, so the research and design of hydraulic excavator system has important practical and theoretical significance. Hydraulic excavator of this thesis outlines the history of technology and its current developments in the foreign country, outlines the development trend of hydraulic excavators, hydraulic excavators used this hydraulic circuit for a simple set and analysis, subject to design hydraulic excavator hydraulic system design and analysis, and by further calculation to determine the need plete selection of ponents. AutoCAD drawing using hydraulic system diagram, hydraulic layout, . Finally, tests prove the feasibility of this design. Keywords : Single dou excavator , the excavator hydraulic systems , hydraulic layout 。 IIII
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