Taiwnan’s second-generation national health insurance have been officially launched in 2013, added a new supplementary premium by expanding the calculation base for insured. This approach also reinforced the ability-to-pay principle and enlarge the premium base. As the supplementary premium is calculated according to people by text, supplementary premium’s data are a huge amount. To enhance data accuracy and processing efficiently, ,How the Department of National Health to convince group insured units reporting details by using networks, electronic tools ways. There are difficulties in implementing. Authorities don’t have a systematic learning and understanding to guideline and implement second-generation health insurance electronic reporting system due to the small scale of rental income. Therefore, it is urgent time to gather relevant information and cope strategies for electronic applicant. This research applies the Technology Acceptance Model to explain the rental supplement insured units’ behavioral intentions of electronic reporting system. The objects of study are group insurance applicant in Taipei division. Questionnaire survey was used in the study. We issued 570 questionnaires, the effective questionnaires were 413, the effective rate of 72.5%. Relevant data were analyzed using SPSS software processing. This research results indicate perceived ease of use would significant positive influence perceived usefulness on using electronic applicant. The NHI insured units’perceived ease of use would also positive significant influences behavioral intention on using electronic reporting system. Furthermore, perceived usefulness plays a mediator role between perceived ease of use and behavioral intention. The results show that the usefulness of the unit’s certificate has mediated on choosing to electronic reporting details. Therefore, upgrading perceived ease of use and perceived usefulness is an crucial and important driver for electronic applicant.