Purpose-Recently the prevalence of high-speed mobile communication technology(4G) and mobile terminal(smart phones, tablet PC, etc) is leading innovative change across all fields of our society as well as business environments. Accordingly, the paradigm of traditional E-government services is rapidly changed into mobile intelligent way too. To identify the influencing factors on the using intention of G4C smart app service in this study, based on previous studies, the variables that influence using G4C smart app service are defined ; user cognitive factors(perceived usefulness, perceived easiness), user characteristics factors(user innovativeness, self-efficiency, social factors), service quality factors(convenience, interactivity, accessibility), system quality factors(instant connectivity, safety).Research design, data, methodology - This is designed not only to collect data with questionnaire survey(9/22/13~10/23/13) but also to test hypotheses with SEM by SPSS 21.0 and AMOS 21.0 in both Korea and China. All items are used with Likert 5 scales. 643 questionnaires(Korea 318, China 325 copies) are used to analyze data.Results - The results of study are as follows. The perceived usefulness, perceived easiness in user cognitive factors have positive influence on using intention. The user innovativeness, self-efficiency, social factors in user characteristics factors has positive influence on using intention. The convenience, interactivity, accessibility in service quality factors has positive influence on both reliability and using intention. The safety in system quality factors has positive influence on both reliability and using intention. The reliability has positive influence on using intention. The control variables (Korea and China user) have effects on its control hypothesis. The strategies and implications are suggested to promote the public adoption intention of the smartphone's e-government services based on the results of the empirical analysis.Conclusions - This study proposes implications to help E-governmental officers and companies make strategies. First, this is expected to give some informations on the understanding and knowledges about the process of G4C smart APP service based on the empirical study. Second, this helps to make future policies and ways abut E-government G4C smart APP service. Third, it is proved that super speed mobile communication technology and devices including phones will be crucial factors to change the structure of E-government services in 2~3 years. Fourth, it is necessary to level up the trust and use intension of users.