Probing into the industry characteristics of construction operations and the necessity to make ergonomic improvement for construction operations, this paper analyzed the current research situation of the literature both at home and abroad which apply ergonomic principles to make improvement in construction operations. This study shows that the existing research on ergonomic improvement of construction operations mainly focus on construction safety and specific operations improvement, at the same time, the system research on the ergonomic improvement of construction operations is less. Making a China's leading internationalized construction service company as the object of empirical research, this paper designed the evaluation index system of construction operations’ man-machine-environment system from three factors of human, machine and environment. And applying the Fuzzy Comprehensive Evaluation Method, the paper evaluated the validity of the man-machine-environment system. At last, aiming at the evaluation results, some improvements were given in view of Ergonomics.