The new liberal arts construction concept puts forward new requirements for college teaching in the aspects of multidisciplinary coordination, remolding, and talent training. To implement the new liberal arts education concept in the teaching reform of economics course, based on the learning theories of cognitivism and constructivism, this paper puts forward a teaching mode driven by "task + project", which makes students learn in a specific situation and integrates resources such as learning tasks, projects, activities, and achievements. Combined with the practice of the economics courses, this paper discusses the design of the teaching mode from four aspects: the reconstruction of the curriculum system, the creation of task and project situations, the integration of resources, and the evaluation system. "Task + Project"-Driven teaching better integrates the new liberal arts education concept, but the setting of curriculum tasks and project scenarios needs to be constantly improved according to the curriculum and students' situation.