... In order to gain a comprehensive and accurate (Allan, 1991;FitzPatrick, 2019), this paper employs a case-study approach as the main research method (Edwards, 2010;Grodal et al., 2021;Low, 2000;Malone, 2002). A case-study approach allows for an in-depth examination of a specific context or setting (Gubrium & Holstein, 2001;Kesby, 2000;Kindon, 2003), in this case, as the research work field, a university in Taiwan that implements bilingual teacher training curricula for elementary school (Lofland et al., 2022;Oyinloye, 2022;Wolcott, 2005). By analyzing the context of record through a case-study approach (Johnson et al., 2006;Nord, 2005;Siedlok et al., 2015), coding the information in those record context (Adu, 2019;Parameswaran et al., 2020;Roller, 2019;Skjott Linneberg & Korsgaard, 2019), this research aims to explore the current situation and practices of the BTTCSE (Chamberlain et al., 2011;Fairclough, 2003;Keats, 2009), including the teaching strategies (Smit et al., 2022), materials used (Denzin & Lincoln, 2011), and challenges faced in the implementation of bilingual education in science teacher training (Cornwall & Rachel Jewkes, 1995;Felder et al., 2023). ...