A mathematical formula plagiarism detection algorithm based on binary tree is proposed. Firstly, the paper gets the mathematical formula from the detected document, generates the binary tree of the mathematical formula by its La Te X form, normalizes the binary tree structure to get the structure code, and then searches the table that named the structure code. If the tale exists, then indexing the record that equals to the formula element of root node and the normalizing variable names pre-order traversing ...