Abstract: In order to learn variation rules of the number of unoccupied parking lots with period of time and to forecast parking information for drivers' parking decisions before their trips,on the basis of statistical analysis of a true park's unoccupied parking space data with time,some useful conclusions and rules are obtained including the variation rule of the number of unoccupied parking spaces of one week's working days,the variation rule of the number of unoccupied parking lots of the near working days and the variation rule of the number of unoccupied parking spaces of the farther working days.Then from these the method and basis for parking forecast are obtained,and by the fuzzy c-mean cluster way parking characteristic of every period of time is classified and forecasted,which can help drivers make decisions of their trips.