Provided are a method and system for determining a legal instrument: obtaining first instrument word segmentation data on the basis of word segmentation processing carried out for text information of an acquired first legal instrument; then inputting the obtained word segmentation data into a pre-trained network model for processing to obtain a first characterization vector of the first legal instrument; acquiring a second characterization vector of each second legal instrument in a legal instrument set; and determining a second legal instrument corresponding to the first legal instrument on the basis of the first characterization vector and the second characterization vectors of the second legal instruments. Thus, the present method may assist a legal personnel in quickly looking up a case file similar to a first legal instrument in a legal library.
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