The Hong Kong Institute of Education is offering a Three-year Full-time Certificate in Education Course (Primary Education) and an In-service Course of Training for Teachers in Primary Schools. Because the latter course has a fewer course hours than the former course, there is a notion in the Institute of lengthening the latter course in order to upgrade it into a Certificate in Primary Education (Part-time) Course. The author is interested to compare the Final-year trainees in these two courses on their Self-Efficacy Beliefs in Science Teaching, hoping that it would activate the comparative studies on some other aspects of these two courses to see if the findings would support the above-mentioned notion to upgrade the latter course. An instrument HKSTEBI was generated to measure the construct of Science teaching efficacy beliefs. It was found that there is no significant difference between the two cohorts of trainees in the above-mentioned course.