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A group is essentially a sum of individuals contributing to a common goal under the guidance of a leader and a certain common identity. Questionnaire cohesion of the group (Group Environment Questionnaire - GEQ) is a tool, containing 18 statements quantified responses from 1-9 (1 - strongly disagree 9 –strongly agree), for the analysis of a sports group. It allows the collection of data on the group from four perspectives: individual attraction to the group –social,  individual attraction to the group – task, Group Integration Social, Group Integration Task. The questionnaire was applied to 6 volleyballs teams from National League at the beginning of the national championships, 2016-2017 seasons. The study aims is obtain and analyze information’s about the cohesion of the teams from first league of volleyball and their correlation with sports performance achieved. Results will be analyzed using the program SPSS 20.0 for Windows. Data analyses shows a good correlation between cohesion of the group and sport performances. In conclusion we can say that large group cohesion is considered an important factor in achieving performance.