This study aims to (1) determine the science process skills of students in class XI IPA SMAN 1 Wawonii Tengah in fluid practicum using used media media. ( 2) To determine the effect of used material media on the science process skills of students in class XI IPA SMAN 1 Wawonii Tengah. (3) To find out what factors influence the science process skills of students in class XI IPA SMAN 1 Wawonii Tengah. This research was conducted using a quantitative survey method at SMAN 1 Wawonii Tengah. This research technique uses a questionnaire to determine the use of used media media, performance tests to determine science process skills, observations and interviews to determine the factors that affect students' science process skills. The results showed: (1) the science process skills of students in class XI IPA SMA were categorized as adequate with an average of 75%. ( 2) There is a significant effect of the use of used material media on the science process skills of students, which is 16.1%.(3) The factors that influence science process skills are basic abilities, attitudes of students, interest and motivation to learn and the limitations of tools and practicum materials.