This study aims to understand the tasks of social workers in a early intervention professional team. The researcher used the qualitative research methods to collect the data from an early intervention professional team. The individual in-depth interviews with 15 social workers were conducted. Furthermore, eight professionals from medical rehabilitation and special education were recruited to discuss the tasks of social workers among the intervention teams in two focus groups. The two types of tasks for social workers are emerged in the study: ”family service” and ”professional team implementation and maintenance.” Furthermore, the research findings would provide suggestions for the social work education and practice development.