Abstract: Based on the concept of landscape ecological security pattern optimization, GIS technology and principal component analysis method was used to optimize the landscape ecological security pattern of the study area from the perspective of integrity and connectivity of the ecosystem, so as to determine the three key elements, namely, ecological sources, ecological corridors and ecological nodes. The results showed that two principal components were extracted from 11 indicators influencing the ecological landscape connectivity in the study area. The first principal component was named cohesion index; and the second principal component was named the connectivity index. The 270 m grain level, under which the ecological landscape was the most stable and the scale was the most suitable, was taken as the reference area. 59 ecological sources, 59 ecological corridors and 21 ecological nodes should be taken as the key points for the construction of forest city in the study area.

Key words: landscape ecological security pattern, ecological source, ecological corridor, ecological node, connectivity, forest city construction, Gaoan city