The examination-oriented education, de-emphasis of hands-on practical work in science lessons and the lack of interdisciplinary curricula are some of the major constraints or obstacles for STEM education in China as reflected from their deficiency or ineffectiveness in nurturing gifted students or talents. In this presentation, we will report two different innovative ways to employ technology and field-based learning for effective STEM education as based on our prize-winning educational device (called mobile logger for science and environmental studies with a corresponding software/app called SESlogger). In the first case, a cartoon video was specifically developed for teaching the primary school students on how to use the device and then students were arranged to practice it for field-based learning in a Guangdong school campus. In the second case, the mobile logger was used to collect on-site environmental data for hiking through all the ten sections of the MacLehose Trail with a total distance of 100km and then the best section of the Trail was designed as a kind of technology-enhanced field trip for trial run by some university students in Hong Kong. To evaluate the educational effectiveness, students' attitudes and views towards the STEM lessons and activities have been collected using questionnaire survey (together with the pre-test and post-test scores on the students' cognitive understanding and level of practical performance) or interviews. For these two cases, we will also present the findings on students' learning difficulties and field-based implementation problems or issues together with reflections from the researchers themselves. Copyright © 2020 International Conference on Learning and Teaching.