The effect of temperature on growth and flowering of Phalaenopsis white hybrid grown in greenhouse and phytotron at different day/night temp. of 20/15℃, 25/20℃, 30/25℃ were studied. About 3 year old mature plants of white hybrid having been grown at 30/25℃ for 4 months, then moved to 20/15℃ and 25/20℃ condition to accelerate flowering. 100% flower-stalk emergence were reached after 25/20℃ and 20/15℃ treatments for 30 days and 65 days, respectively. Days from emergence to flowering required 104 days and 205 days for 25/20℃ and 20/15℃, respectively. At 20/15℃, flower stem and no. of florets per stalk were shorter and lees than plants at 25/20℃ and also formed abnormal inflorescences with aborted florets. Plants grown at 30/25℃ didn't form flower-stalks until the late October when daylength decreases gradually, and about 43% flower-stalk emergence was reached and 67 days wan required from emergence to flowering. It brought about flower-stalk elongation continuously by transferring from 30/ 25℃ to unheated greenhouse in the middle of January. These results indicated that at 30/25℃, development of florets was promoted and initiation of flower-stalk was suppressed. Phalaenopsis plants grown at 15-30℃ emerged flower-stalks mainly from the axil of the 5th node below the uppermost leaf and continued to form leaves slowly during the period of flower-stalk development.