Landscape architecture history, as the core course of landscape architecture major ( LA ), has the important value of exploring ceaseless history to inspire the future. However, the teaching system needs to be optimized under the background that the boundaries of LA are constantly expanding and history as the mode of thinking. Through investigation and analysis, the current teaching of this course has some practical problems, such as the outline framework of "strain at a gnat and swallow a camel ", case analysis of "emotion to reason split", and teaching method of "heavy emphasis on teaching and light practice". Based on the perspective of synergetic theory, this paper proposes to optimize the teaching system by means of optimizing the knowledge structure of the three departments, deepening the cognitive mode through the integration of emotion and reason, and forming historical thinking through related practice. Through the feedback of teaching practice results, it is believed that the students can break through the traditional perspective to pay attention to the overall environment, the passive and receptive learning mode is fundamentally changed, and the construction and implementation of the progressive practice system promotes the formation of their historical thinking of landscape architecture.