Abstract: The present experiment, with the sweet cherry (Prunus avium L.) 'Hongdeng' as its cultivar, investigated the dynamic changes of the fruit growth and development as well as the endogenous hormones of the pulp. The results showed that: The content of ZRs in the pulp had the highest values in the beginning of the first fast-developed period (5th day after full bloom), and then had a tendency of decrease with the fruit, grew and developed until maturated.The contents of IAA and GAs in the pulp of young fruit were high in the first fast-developed period(5th -15th day after full bloom), then decreased with its development until the end of the core-harden period (25th day after full bloom), and they all had a tendency of increase in the second fast-developed period (25th -40th day after full bloom) until maturity, corresponding with the fruit growth. The content of ABA had the peak values in the 5th, 15th, 35th day after full bloom, similar to the fruit (flower) dropping periods.

Key words: Sweet cherry, Fruit growth and development, Endogenous hormone