Germination studies on the Calocedrus formosana (Florin) Florin under different temperatures and photoperiods, were conducted to find a suitable condition for germination. Under 24 hours light, the seeds reached the maximum germination percentage in constant temperature 20℃ (46%). Under 16 hours light, the seeds reached the maximum germination percentage in constant temperature 20℃ (44%). Under various alternating temperatures and different photoperiods, the seed reached the maximum percentages in 20-5℃, 16 hours light (41%). It is concluded that the seeds of Calocedrus formosana (Florin) Florin showed better germination percentage under 24 lights, but the seeds germinated earlier and faster than other treatments under 16 hours light and can shorten the final counts of germination duration.