Water spray is used for cooling suction air of gas turbine. The aim of this study is to investigate the spraying properties and the influence of secular change in the spray nozzle. PDA measurements are conducted in wind tunnel. Four types of nozzle are tested. Same type nozzles with different using period are also tested. The nozzles are new one and old one which is used 1750 hours. The spray properties in high spatial-temporal resolution are provided by the PDA. Also, The droplet size by a pin type nozzle doesn’t change after 1750 hours. On the other hand, the velocity and flow rate decrease after 1750 hours.