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Understanding of a concept can be said as the ability of learners in expressing and re-explaining the information that has been received each learner. Understanding the concept of students said good when given the problem, learners can solve the problem well. This study aims to see the improvement of students concept understanding during science learning using Problem Based Learning for the concept of pressure in accordance with the curriculum of 2013 class VIII semester II. The research method used is a weak experiment with The One Group Pretest-Posttest Design. This design is used because researchers do not use the control group. This research was conducted in one of class VIII in Secondary high school Negeri in Sidayu District Gresik Regency. Aspects of understanding of concepts seen are limited to only a few aspects, namely aspects of translating, interpreting, and extrapolating. The result of the research shows that there is an increase concept comprehension for each aspect of understanding the concept of pressure in accordance with the calculation of n-gain, ie the translate aspect is 0.52 with the medium category, the interpreting aspect is 0.62 with the medium category, and the extrapolation aspect is 0.47 in the medium category. Based on the results of the calculation of n-gain can be said Problem Based Learning can improve understanding of the concept of pressure students of Secondary high school class VIII.