The objective of this work was by testing imbibition,seed germination,some physiological indices between the different stratification time and germination inhibitor assay;chemical treatments were implemented to reveal the seed of dormancy mechanism and to research the effective dormancy breaking method of Styrax tonkinensis seeds with shells,which was 5 years form guanshan forest farm in Ji’an Jiangxi.The results indicated that:(1)The reason of seed dormancy includes episperm barrier,deficient of germination hormones and germination inhibitors existing in both embryo and episperm;and episperm barrier and the existence of germination inhibitors are the primary limit factors.(2)The embryo dormancy of S.tonkinensis can be relieved after GA₃ treatment and stratification at natural low temperature for 30 days,but episperm barrier is always the key constraint factor for its dormancy.(3)The chemicals such as GA₃,NAA and 6-BA etc.treatments were used to improve the germination rate of S.tonkinensis seeds;one of the effective ways is by 500 mg/L GA₃ treatments 24 h for the carved seeds.