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By dint of historical organization and case study of the interaction between poster design and artists during the period of "Art Nouveau", the paper analyzes the historical environment for artists who had participated in poster design, resolves the interaction and explains the value and significance of the research on the course of "interaction". In terms of argumentation, the paper combines integrated investigation and literature review, attempting to: (1) discuss the change of inertia thinking of poster design influenced by "crossover" interaction in the context of contemporary; (2) provide some useful inspiration for expending poster design thinking and broadening creative horizon; (3) and become a useful supplement to the theory of poster design. The current research on "Art Nouveau" poster is mostly an overview. Domestic research is as follows: European Art in Nineteenth Century (Vol.2) by Zhang Gan describes the situation of Alphonse Mucha's creation and the corresponding poster works in the fourth chapter of the second section; "Art Nouveau" by Gao Bingqiang compares the "Art Nouveau" lithograph poster design from the perspective of history and geography in the second part of the preamble "Boundary and Fusion". Foreign studies such as: Barnicoat. John: A Concise History of the Poster, Lodon: Thames and Hudson; Gallo. Max: The Poster in History, New York: American Heritage; They introduce the emergence and development of poster design during the period of "Art Nouveau". From the information obtained, most of
Nan Li (Mon,) studied this question.