Abstract: The study of the pest population dynamic was carried out systematically in the Fuqing District's pine forest. There are 4 obvious pears in population's dynamic at nature, but only one the pear in mid-April is the most significant. From the first-ten-day of April to the first ten day of July the pest have the highest density at same time the pine have been damaged at this period. Using the analyzation of time series data,the relation of the pest population time series data and climate's factors was studied. ...