Abstract: The seeds of Ormosia pinnata possess the typical physiological characteristic of "recalcitrant" seeds. The inhibitive substance existed possibly in their testae is the major factor affecting the germination. Removing the testae before sowing is one of the better methods for eliminating it. The temperature and pH value in surroundings are also the important factors for their germination. When the temperature is at 29.5~33.0℃ with pH value 3.8~6.6, the seeds germinate better. When the chlorophyll content in cotyledons tends to zero, mature seeds have appeared. Losing moisture content faster is the fundamental reason for the poor-maturity seeds and the small seeds lose their vigour more easily.