We live in the times when the change of science and technology has a good place to develop the science mind of people. Therefore it is very important to investigate the needs of its visitors to improve Science Museum. Present situation shows that group visit is a major form of visit to Science Museum in Korea. So, in this paper the actual conditions of the museums were investigated and researched on the basis of the visitors’ opinion. The four different museums observed are National Science Museum, Seoul Institute of Science Education, Children’s center, and LG Science Hall. The 702 students and 35 teachers having visited at least one were surveyed on the degree of satisfaction. The results are as follows. 1. Science Museum operation geared basically to creating science climate for teenagers and adults which enhances them to learn science first hand. 2. A Visit is carried out by some definite factors; official documents or teachers’ decision on educational effect. 3. Selected four elements of Science Museum are ‘visit convenience’, ‘exhibit level’, ‘educational function’ and ‘environment & climate’. Relative importances of them are equally distributed in the survey of students. 4. The choice of using and attending a Science Museum by teacher depends on following order of factors: The first is educational function i.e. whether the museum has relevant scientific contents and explanations for educational purpose. The second is whether the museums facilities are easy to use, nicely set up and convenient to go. 5. Relative degree of satisfaction to each Science Museum depend on several variables; explanation, interest, and environment & climate. As a result, this paper offers four data; an index of visitors’ satisfaction, the comparative standard between Science Museums, the justification of Science Museum, the useful materials to service development of Science Museums.