of vaccination through typical case interviews and experimental reports, so as to enhance the public’s perceived self-efficacy of vaccination. At the same time, doctors’ recommendations and popularization of vaccination knowledge can also used to be stimulate the public to vaccinate. In addition, it is necessary to minimize the public’s VH. An effective approach would be to ask groups that have been vaccinated to highlight the safety and necessity of vaccination in order to help increase public confidence and reduce complacency for vaccination. The above practices will have a positive impact on the public’s vaccination. Second, government and related policy-making institutions should take full advantage of the perceived usefulness of vaccination; in this regard, medical research departments need to strengthen clinical exploration of vaccination and constantly strive to improve the effect of vaccination, so that the public can experience the usefulness of vaccines in protecting physical and mental health. In addition, government should also ensure convenience and provide benefits to the vaccinated public. For instance, in terms of travel, shopping, and medical services, relevant departments can provide certain priorities and discounts for vaccinated groups so that they can really feel the usefulness of vaccination. The above measures will prompt the vaccinated population to get vaccinated again in the future. Limitations and future directions A major limitation of this study is that we conducted data collection in China. COVID-19 in China is longer as serious as it was during the start of the pandemic. Moreover, vaccine development in this country is at the forefront of the world, according to the rates of vaccination. Therefore, the findings of this study may not be applicable to those countries where the epidemic is severe and vaccination technology is not as advanced, such as India. In addition, we find that VH has a negative significant impact on vaccination intention for the first time. So, does this variable have a similar effect on continuous vaccination? Researchers can explore this issue in the future. Conclusions Vaccination for the COVID-19 provides an effective approach for the general improvement of social safety and individual health. To date, few studies have analyzed the continuous vaccination for COVID-19 vaccine and its impact process. Using the HAPA Model, ECM and VH theory, this research evaluates the continuous vaccination for COVID-19. The respondents in this study were individuals in China who have been vaccinated. Six valuable and novel findings are identified through this research. First, perceived Page 18/22 efficacy has a positive significant impact on vaccination intention, but the positive effects of outcome expectancy and risk perception on vaccination intention are not significant. Second, social positive cues have a positive significant influence on vaccination intention. Third, VH has a negative significant influence on vaccination intention. Four, vaccination behavior produces a positive significant effect on perceived usefulness and satisfaction, respectively. Five, perceived usefulness exerted a positive significant impact on satisfaction and continuous vaccination, respectively. Six, satisfaction has no positive significant influence on continuous vaccination. Our theoretical model, which is the main contribution of this research, indicates that individual continuous vaccination is a process from motivation to intention, and from intention to behavior, and then from behavior to continuous behavior. Declarations Ethical Approval and Consent to participate The participants were informed about the purpose and procedures of this study via an advertisement before the investigation. Moreover, participants were voluntary and anonymous throughout the investigation. Consent for publication Not applicable. Availability of data and materials The datasets used during the current study are available from the corresponding author on reasonable request. Competing interests The authors declare that they have no competing interests. Funding Not applicable. Authors' contributions WZH and YX conceived and designed the study; WZH and YX conducted analysis and interpreted data; HZ and YS collected data; WZH and YX drafted the manuscript and all author contributed to revise it. All Page 19/22 authors read and approved the final manuscript. Acknowledgements Not applicable. References 1. Khanal P, Devkota N, Dahal M, Paudel K, Joshi D. Mental health impacts among health workers during COVID-19 in a low resource setting: a cross-sectional survey from Nepal. Globalization Health. 2020;16(1):1-12. 2. Ledford H, Cyranoski D, Van Noorden R. The UK has approved a COVID vaccine-here’s what scientists now want to know. Nature. 2020;588(7837):205-6. 3. MedSci: Bulletin of global COVID-19 and vaccination on July 7, 2021. [https://www.medsci.cn/article/show_article.do?id=504c21386590]. Accessed 30 July 2021. 4. Schwarzer R, Lippke S, Luszczynska A. Mechanism COVID-19 Vaccine Acceptance among Social Media Users: A Content Analysis, Multi-Continent Study Ramy Shaaban 1,† , Ramy Mohamed Ghazy 2,† , Fawzia Elsherif 3,*, Nancy Ali 4 , Youssef Yakoub 4 , Maged Osama Aly 5 , Rony ElMakhzangy 6 , Marwa Shawky Abdou 3 , Bonny McKinna 7 , Amira Mohamed Elzorkany