This study was carried out to investigate the effect of maleic hydrazide upon the winter hardness on leaves spraying after harvesting of autumn rearing season. The results obtained are as follows; 1. Spraying over 0.25% increased starch in all tissues of the twig than that in the not-sprdyed control twig. 2. Spraying time of central district was the middle ten days of september. 3. There were effect on spraying of all the treatment variety Suwon No. 4. 4. Winter hardiness by variety was strong in the order of Suwon No. 4, Gae Ryang Su ban, Il Jire, Rosang.