The adoption of educational technology in teaching depends on how well a teacher accepts it. This paper draws on a technology acceptance survey of pre-service primary mathematics teachers in Hong Kong to study the factors influencing their technology acceptance. This work adopted a mixed method approach, in which quantitative data were collected through questionnaire survey from 234 pre-service teachers, where the data were analysed using structural equation modelling with a customised technology acceptance model. The qualitative data were also collected from 14 of these pre-service teachers through interviews, and analysed using the iterative coding process. The results show an overall positive attitude towards the use of educational technology, while perceived usefulness is more influential than perceived ease of use. Perceived ease of use is found to rely heavily on facilitating conditions rather than computer self-efficacy. We also found that subjective norms have an indirect influence on the usage and adoption in our context. Explanations for these findings are discussed, together with implications of the results. Our findings are intended to provide insights to policy makers about how to design teacher education programmes that address the demands of learning and teaching with educational technologies in Hong Kong and related contexts.