Through accurate and multiple differential GPS (ProMARK X-CM),a program of dynamical monitoring reclaiming coastal land, concerning field data collection, data process and map match with TM image was established in study area, Tongming Sea of Zhangjiang and He'an Township of Xuwen County, Guangdong Province. The research results indicated that (1) Using GPS data as control points, the precision of geometric correction of TM image was raised. (2) Aided by the GPS data, the classification accuracy of TM image was improved. (3) The GPS could be able to collect current data of enclose tideland for cultivation engineering.