Abstract: These experiments were conducted in Deqing county of Guangdong province during March-May 1985.The attractive extent and effect were observed in blacklight traps to the pine caterpillar moths. The virgin females and males were marked and released,then recovered in blacklight traps.The females and males were recovered as much as 162 and 643 m respectively from the release points where 1% of the moths were recovered.The females moths captured contained an average of 95 eggs in the blacklight traps,23.8% of the eggs were killed in the females captured.