Abstract: The objective of this study was to by means of Logistic equation studied the height and diameter of annual Manglietia insignis seedlings from three different geographical sources(Dafang provenance,Leishan provenance and Rongjiang provenance), and then analyed the growth rhythm of annual Manglietia insignis seedlings.The results showed that the growth pattems of height and ground diameter of three provenances were similar to ‘S’ curves and could be fitted with Logistic equation.And by equation the four stages could be divided into emergence period, early growth period, vigorous growth period and later growth period for the growth of height and ground diameter.The rhythm of the height and ground of the Manglietia insignis seedlings three provenances were same.The start time of vigorous growth period for the height from Dafang provenance was earlier than Leishan provenance and Rongjiang provenance,but the end time was to be posterior to Leishan provenance and Rongjiang provenance 1-2 months;The start time of vigorous growth period for the diameter from Dafang provenance was earlier or later than other provenances,but the end time was later than other provenances 5-7 days; The height and diameter of vigorous growth period from Dafang provenance were long, but the growth rate were slow. Instead,the height and diameter of vigorous growth period from Leishan provenance and Rongjiang provenance were short, the growth rate were fast. Annual growth in height of Manglietia insignis seedlings from Dafang provenance,Leishan provenance and Rongjiang provenance were 16.12 cm,16.75 cm and 16.42 cm; Annual growth in diameter were 5.52mm,6.27mm and 6.05mm. There was no obvious difference in height between different provenances.The diameter in Dafang provenance and Leishan provenance had significant difference, but other provenances had no obvious difference. There was a large variation between different provenances and within provenances. The height and the ground diameter of the seedlings from the Leishan and Rongjiang provenances are batter than the seedings from the Dafang provenances.