The invention provides an electricity usage behavior analysis method based on an FCM clustering algorithm, comprising steps of (1) copying electricity usage data from a relation database into a distributed file system HDFS to determine the clustering number c and a stopping field Epsilon, (2) determining an initial clustering center according to the clustering result of the last time, and transmitting the data to data nodes participating distributed calculation, (3) performing pre-processing on the electricity usage data and producing a key value pair , (4) dividing all the key value pairs into a plurality of data subsets and transmitting the data subsets to a Map function for calculation, (5) transmitting the Map function calculation result to an Reduce node, wherein the Reduce task combines the middle key values produced by the Map according clustering numbers and then performs calculation to obtain a new clustering center, and (6) repeating the steps (2)-(5) until a membership grade matrix satisfies the conditions of the stopping field, finishing the algorithm and outputting the clustering result. The electricity usage behavior analysis method performs direction calculation based on the file massive history electricity usage data and obtains the electricity usage behavior characteristics.