Hydrosphere movement in coastal zone performs as salty and fresh water mutual function. The Longkou city
coastal zone which moves in the humanity under the intervention, has initiated the large-scale sea water intrusion, and
therefore was especially under severe circumstances since 1980s. Until the end of 1980s and the beginning of the 90's,
the sea water intrusion zone has formed the belt which spread fast from several hundred meters to several thousand
meters along the coastal zone of Longkou city. Taking the landsat TM images in 2000 as data sources, first we applied
the principal components transformation and analysis to analyze the six TM wave bands, and then use the histogram
equalizing to deal with them. We use the two-value approach to be possible to remove the villages and small towns, the
path, the pond (fishpond), the vegetables greenhouses, the rivers, the sand very conveniently. We take wave band as the
research band, TM3, TM4 and TM5, which passed through correlation coefficient confirmation. Using the principal
components analysis method to determine vegetation degree of coverage, the bare land index and the green index, the
humidity analyzed in turn as four factors of the sea water intrusion. Inversion model of sea water intrusion is build up
with the four factors. Finally a case study on the Longkou city, the analysis is obtained that the results have a very good
correlation with the field measurements, and in accordance with the extent of the intrusion is divided into four categories.
Ecological land layout is a key step of land use planning. Effective ecological land layout could benefit to the
ecology, economy and society. Based on Matlab, a new simple osculating method was introduced in the paper, which
was used to provide the basis for land layout. At the same time, GIS was used to be the technological platform for
dividing land planning unit, managing all data and displaying all land layout planning results. The new planning method
includes 4 steps. Firstly, the land should be divided into many planning units in GIS. Secondly, several planning targets
should be chosen. The third step is to select indicators to be analyzed and to determine their weights. The forth step is to
calculate osculating values and to layout land planning units for different needs. Finally, all the land would be laid out to
satisfy all needs. A case study on Houjie Town was presented to demonstrate the new method. Considering land use types
and the number of requests, the comprehensive ecological land layout planning was ensured. Six pictures in different
colors showed the results of ecological land layout planning on Houjie town.
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