The lack of teaching materials that support learning in a group of physics that a valuation technique other than teachers and facilitating the learning pace of each student is different underlying physics module development class X with peer assessment on the subject matter of the circular motion in SMA Muhammadiyah 1 Banjarmasin. This research aimed to describe the validity of physics module developed with peer assesement. Data obtained through the validation module sheet. The data analysis technique is comprised descriptive analysis of the validity of the module. The results showed that the validity of the module developed valid.