This research is motivated by the various in the speed of learning and passive students during learning. In addition, SMA Muhammadiyah 1 Banjarmasin no modules are used in physics learning. This study aimed to describe the validity of modules developed in class X SMA Muhammadiyah 1 Banjarmasin. Physics module validation consists of material and media validation. Validation of the material consists of content quality, organization, language, evaluation, and glossary. The media validation consists of consistency, format, appeal, the shape and size of letters, and languange. The results showed the validity of the module is very valid category. It was concluded that the physics module using cooperative learning with peer assessment eligible for use in learning.