,The design idea and main contents of the questionnaire, which is about the decision-making stage of large engineering project in China, were introduced in the paper. The descriptive statistics analysis, frequency analysis, correlation analysis and crosstab analysis were used in data analysis. Statistic data indicated that the restraint and incentive mechanisms to the decision maker need further improvement. The working depth of previous research basically satisfied decision-making requirement. But the decision-making work was unsatisfactory. The correlation analysis suggested that the attitude of the decision maker is the decisive factor of the quality of previous research. In view of most of the people interviewed, unfeasibility study is necessary for the large engineering project in China.