This research was performed to evaluate the possibility for field application Pulsatory Direct Water Spray Gun System (PDWSGS) as of newly developed injection system using solenoid valve for laborsaving bud and flower thinning works in pear. The experiment was carried out at an orchard of Gangwondo Agricultural Research and Extension Services. 15-year-old ‘Wonhwang‘ and ‘Niitaka’ with Y-shaped training system were used for the experiment, and the experiments were conducted at different stages of bud stages and different lateral branch ages in pear. In the field application test of Wonhwang‘ and ‘Niitaka’, the flower thinning rate was investigated ranging from 37.5 ~ 77.2%, and 52.2 ~ 78.6%. The highest flower thinning rate was observed at balloon period in both pear cultivars, but leaf bud thinning rate lower than 12% was observed. And as a result of analyzing the fruit characteristic by spray, ‘Wonwhang’ increased the production of large fruits in white flower bud stage, and ‘Niitaka’ increased in balloon stage. Therefore, PDWSGS seems not to have any negative factor for the production of high quality fruit in pear. When this system was applied in a pear orchard with a cultivation area of 1 hectare, the total work duration was 43.2 hr for fruit setting management, while the corresponding work duration was 184.0 hr, for the same area, when performing fruit setting management by hand. Hence, it has been calculated that the newly developed system could reduce 76.4% of the total work duration compared with the conventional method, which also provided about 55.6% cost savings effect for the farms. It is expected that the application of newly developed labor saving system can improve farming income by reducing cost and enhancing productivity.