As for a backhoe, generally, the work efficiency is utilized as one of terms to calculate the work capacity. As the case stands, evaluation metrics such as performance of work tasks, operational skill levels and energy-saving effects are usually and frequently represented by qualitatively volumetric indices of capacity. This paper proposes the work efficiency evaluation model that quantitatively visualizes work efficiency in terms of work control factor, work time factor and workability factor, and serves users with commentary information. Here, physical factors such as work and power are introduced to calculate the workability factor. The commentary information consists of management information, operator bearing, complementary explanation, and early warning, which are accompanied with work commands. It is anticipated that the work efficiency evaluation model could perform rationally purposive evaluation, instructions and education as for performances of work tasks, operational skill levels and energy-saving effects.