The invention relates to a quick 
file comparison method, a quick 
file comparison system and a quick 
file comparison client side. The quick file comparison method comprises the steps of: e scanning and analyzing a local file 
directory by the 
client side; according to the variation of the local 
file system, updating a first identification tree maintained by the 
client side; corresponding a node in the first identification tree to each local 
directory of the 
client side, wherein node information comprises a node identification and relevant 
directory information; comparing a second identification tree maintained by 
server side equipment with the first identification 
tree node by node by the 
client side; recording a difference node and a variation file corresponding to the difference node; and according to the difference node and the variation file, providing data to the 
server side equipment section by the 
client side so as to update the second identification tree maintained by 
server side equipment and a stored file. According to the quick file comparison method, a mode of comparing node information for reflecting the local 
file system of the client side is adopted, and due to the mode, the quickness is realized, the mode is more suitable for bigger and a more complex 
file system, and the file comparison efficiency and performance can be effectively improved.