Abstract: A mathematical formula matching algorithm based on binary tree was proposed．Firstly,generating the binary tree form of a mathematical formula by its LaTeX form,normalizing the binary tree structure,and then pre-order traversing the binary tree to get the formula elememn sequence,normalizing the variable names．For two mathematical formulas to be matched,the similarity is computed by the number of the equal formula element at corresponding position．The experimental results show that the algorithm realizes the accurately recognition of mathematical formula,so it is a more practical algorithm.

Key words: Mathematical formula,Binary tree,Normalization,Similarity