From remote sensing image data and the data collected have built the sample data file consists of 5 layers: professional land rice cultivation, planting ground every other year, ground water, streams, soil ground construction with high accuracy. By the method of GIS and remote sensing image interpretation were the three years 2005, 2010 and 2015 Hai An district-Hai Phong city with precision in turn is 72.5%, 82.5%, 86.5%, on the basis of which established the three land use map respectively, conducted her husband arranged to build two maps of land use changes in the period 2005-2010 and 2010-2015 , which reviews changes in agricultural land of the area of research. In the period 2005-2010, land to build up more for 983.56 ha, rice soils due to switch to other crops, the land of 74.07 hectares transferred 773.23 hectares of land, the water switch to 136.26 ha. Land for other crops most 671.05 ha due to move into land with the water, moved into the building. The period 2010-2015 land build up 1559.29 hectares of land, is specialized in rice cultivation decreased 60.12 ha of land, other crops reduce soil water, reduce 730.03 769.10 ha The cause of volatility is due to the influence of the process of urbanization in the Hai An district, shown in the following aspects: immigrants and the population pressure to the area with the level of volatility of different land uses; planning and development policies; the development of infrastructure to changes in land use.
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