The MADS-box gene is an important transcription factor, and is the key gene involved in plants growth and signal transmission.Recently, some floral growth genes including floral organ identity genes, meristem identity genes and some genes promoting flower have been identified and separated from different orchids.These researches indicated that the A-function genes might relate to the floral organ development and controlling flower.The B-function genes might regulate the tepals form and special structure.And some genes are expressed in vegetative organs.