Abstract: A total of five tropical and precious timber species aged 1.5 were planted under the rubber plantation aged 15 and the ground diameter and height of the five species were observed in February, April, June, August, December 2016, and February 2017. The results showed that the peak growth period of ground diameter was basically between June and August each year. The peak growth period of tree height was basically between October and December each year, and the peak growth period of tree height of Dalbergia odorifera was between February and April, Dipterocarpus turbinatus Gaertn tree height growth peak occurred during December and February period.