Abstract: A six years life table analysis is made for a Dendrolimus spectabillis population in Wendeng city of Shandong province. The key period affecting its population change is larva peried before and after winter time. Wasps and birds predation,pathogen affection and low temperature during larva period after winter,as well as ants and mantis predation and precipitation during larva period before winter are the main reasons for the annual change of Dendrolimus spectabillis population.The population tendency index is defined as I=5.0440.

Key words: landscape pattern metrics, urban heat island, landscape pattern, land surface temperature, Beijing.