The invention discloses a subway passenger demand dynamic acquisition method and an acquisition
system thereof. The subway passenger demand dynamic acquisition method comprises the following steps: 1,building a demand
lexicon, and obtaining user message sending data from a
social network platform; 2, preprocessing the obtained data; 3, filtering texts irrelevant to subway passenger demands by adopting a
support vector machine classifier; 4, performing
correlation clustering; 5, for each clustering cluster, giving a
label as a demand item, and calculating the importance of the demand item; 6,firstly judging whether the demand item exists in the demand word
bank, if so, exiting, and if not, judging whether the importance degree and the relative propagation persistence of the demand item simultaneously meet a preset threshold value, if so, discovering a new demand item, adding the new demand item into the demand word
bank; and if not, exiting. According to the invention, a large numberof user sentences can be processed; the user demand acquisition efficiency is improved; and the subjectivity is low; demand preferences and potential user demands can be obtained from massive user sentences in real time.