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Instruments in a study have a huge influence on determining the quality of a research instrument or good measuring instruments are valid and reliable, where validity is the ability of an instrument to Precisely measuring it. In addition to the validity, a test given to students should also be reliable or achieve the measurement with the exam carried out to achieve consistent results. The purpose of this research aims to determine the quality of the instrument of physics by using Rasch methods in learning High school physics. This type of research uses a quantitative approach using the Rasch method of analyzing the data. Sampling carried out using random or random sampling techniques with the subject of the study is X class MIA 1 and X MIA 2 MAN 2 Gorontalo regency. The research instrument uses a self-assessment sheet that is distributed to each student. The analysis technique is cultivated using Rasch method through the Ministep software program. The results showed that out of 50 respoden there are 30 students who have a good/high physics learning attitude and include valid with logit value above 0.0, then there are 7 students who have an attitude to learn physics that are not good/low With logit values below 0.0 and 13 students are declared invalid because they do not meet the criteria fit. The result of the validity of respondents indicates that students are more likely to approve items. While the validity of a grain item indicates that the instrument with a called grain can be used to measure. The level of reliability of respondents still shows weak looks based on criteria while the reliability of AItem shows is very good.