This study uses mixed methods to explore Chinese primary school teachers’ working time allocation after the enactment of the “Double Reduction” Policy. Data were collected from 364 questionnaires and six subsequent in-depth interviews. Findings reveal that despite having brought about some benefits, the “Double Reduction” Policy has increased Chinese primary school teachers’ working time. Moreover, the teachers’ working time is unevenly allocated, with disproportionately more time devoted to subject teaching and less time devoted to professional development. As a result, the nature of the different types of Chinese primary school teachers’ working time further affect the teachers’ perceived workload and work-related stress. Therefore, it is recommended that teachers recieve greater support and time for their ongoing professional development.