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Yang is generally considered a member of the Doubting Antiquity School, as he argued that the pre-Xia Dynasty history recorded in ancient texts was "historization" of prehistoric mythology, a position that is widely accepted by today's historians. However, he disagreed with Gu Jiegang and Kang Youwei's view that ancient scholars such as Confucius and Liu Xin deliberately introduced falsehoods into historical texts, and held the opinion that it was a long process of natural evolution of ancient mythology. Gu later changed his position and accepted Yang's view. Yang further differed from Gu in that he also believed that the extant history of the Xia Dynasty was pure mythology.