Abstract: As one of the most important management tasks for construction enterprises, investment prone to exceed its budget because of inadequate control. To evaluate the construction of coal mine with annual production over 10Mt, the paper took Tongxin mine as study object, established the evaluation index set, determined indexes weight by the AHP, determined the index membership degree by duality element relative comparison. Combined with fuzzy comprehensive evaluation, the investment control effect was evaluated; meantime the key factors that influence investment were found. The study contributes to summarize experiences and control crucial links for coal mines. Practice shows that F-AHP model not only eliminates subjectivity but has excellence of comprehensiveness，scientificity and operability.

Key words: investment control, analytic hierarchy process (AHP), duality element relative comparison, membership degree, fuzzy comprehensive evaluation