This paper explains the experimental result of land use change monitoring in Nanpi county of Hebei province through applying image processing techniques. The procedure contains: A. calculating brightness index （BI） and perpendicular vegetation index （PVI） of TM and SPOT images received from different time respectively: B. manipulating a change vector in BI-PVI space; C. automatically outputing classified change monitoring image. After verificating the 22 change pieces on output image mentioned above

it has proved that the changes monitored are completely coincide with the practical situation. And it is very possiable to extract the information of land use changes by processing images received from different time and to analyse area changes of cultivated soil and staple crops. So this method could be widely used in land use change monitoring.