The main purpose of the research was to study the effect of applying information technology on the effectiveness, efficiency and group decision-making of the employees of Techno-Professional Organization in Mazandaran. The method of the research was a kind of survey descriptive method, and the statistical population of the research included 419 people, that is, all the employees of Techno-Professional Organizations in five cities (Babol, Ghaemshahr, Sari, Neka and Behshahr). The statistical sample was 201 people which calculated by Krejcie and Morgan table. Also, the sample was selected through simple random sampling method. The measurement device was a form of Likert scale five- choice researcher-made questionnaire. Its reliability was estimated through Cronbach Alfa coefficient (a = 0/92). To analyze the research questions, the single group t test was used. The result of the research showed that the application of information technology affects the employee’s efficiency, effectiveness and group decision-making.