Abstract: In the scale of landscape,“the forest landscape patch coupling system” was raised,and was discussed from the coupling system construction condition,construction method and screening method.Furthermore,combined with the landscape index,statistics were carried out to the patch types of the coupling system for characteristics analysis.The results were as follows:1)Threshold value X when equal to 30%,was set as the ration between the number of patches that can be easily affected by human interference and the number of total patches.When screening the coupling,the type of the coupling patches should be greater than or equal to the proportion of different patches in the study area,which was set as the threshold value Y.When Y was equal to 50%,information of the selected coupling system can represent all the others,which was a rational approach.2)Giant coupling system was mainly located in the mountains or in remote mountainous areas,micro coupling system was mainly concentrated in the nearby villages or residential areas,the inside patch of these coupling system can be easily affected by human interference.3)Index of giant coupling system were the best,was the most ideal coupling system.Micro coupling was poor.Large and medium-sized couplings were in the middle level and should be the focus because of its large number.The screening and analysis of the coupling system can provide a basis for the next step research on flow of the energy and material inside the coupling system.

Key words: forest landscape, patches coupling system, landscape index