The objective of this research was examine how to use data mining in updating the required data for decision making of managers of Telecommunication Company of West Azarbaijan province. The method of the research was survey-descriptive. The Statistical Society of the research were managers, assistants and financial managers of Telecommunication Company of West Azarbaijan province which they were 43 people. Due to limitations of statistical Society Sarmary method was used for select the sample.Taghavi Fard et al questionnaires (2007) was used for collect information about the measurement data mining. Scott and Bruce (1995) questionnaires were used for measuring decision making of managers. Comments of supervisors and a number of professors in management field were used to validity of the questionnaire. Cronbach's alpha was used to reliability of the questionnaire which is obtained 0.89 and 0.91 respectively for data mining and decision making questionnaires that indicates the desirable reliability of the questionnaires. To analyze the data, Pearson correlation and regression test were used. Results indicated that data mining has positive and meaningful effect on updating required information for decision making and the aspects of decision making of managers.

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