Information has an important role for human life, therefore every human being needs information in order to support her daily life. The purpose of this research is to know User Behavior toward Small Medium Industry Information System (SI-IKM) Tegal With The Technology Acceptance Model (TAM) Theory Approach. The population of this research is the user of IKM information system. Samples taken in this study are employees of Department of Labor, Industry of Tegal City, surveyors and perpetrators of IKM using the information system. Sampling technique in this research is purposive sampling. The results of this study in accordance with the approach of Technology Acceptance Model Model (TAM), but for Perceived Usefulness variables have no significant effect on Attitude Toward Using variable.