Abstract: In order to improve the germination rate of dormant Brassica juncea seeds,low temperature pretreatment,different culture temperatures and different concentrations of plant growth regulators and hydrogen peroxide were used to treat the seeds of Brassica juncea just harvesting,respectively,for breaking the seed dormancy.The results showed that there was significant influence on improving germination rate of the dormant Brassica juncea seeds at 4℃pretreatment for 1day;It was appropriate for germination of Brassica juncea seeds when treated at 25℃,and the germination of seeds would be inhibited by higher or lower temperature;Among different treatments of GA3,30mg·L-1 GA3 was proved to promote germination of the dormant Brassica juncea seeds;when treated by 2,4-D,the germination of Brassica juncea seeds was accelerated by low concentration,and inhibited by high concentration.It could also promote the Brassica juncea seeds germination when using 0.5%-2.0% H2O2 soaking treated for 2h.