Task-based language teaching is very popular in the modem English teaching.It is based on the Task-based Syllabus.Taskbased Syllabus focuses on the learners' communicative competence,which stresses learning by doing.From the theoretical assumption and definitions of the task,the paper analysizes the components of the task,then points out the merits and demerits of the syllabus.By this means the paper may give some tips to teachers and students when they use the tsk-based language teaching.