Effects of temperature on the germination of Pinussylvesiris var.mongolica and Picea mongolicawere studied by observing their germination characteristics such as germination rate,energy,index,mean gemination time,length of radicle and hypocotyl,radicle/hypocotyl ratio and vigor index.The results showed that different germination temperatures significantly influenced germination characteristics mentioned above.The germination rate of Pinussylvesiris var.mongolica and Picea mongolica were all fairly high in the temperature range from 10 to 25,temperature range of 20 to 25 was their optimum range.When the temperature is above 30,it was not suitable for seed germination of Pinussylvesiris var.mongolica and Picea mongolica,because some or all of germinating seeds were rotten.At the optimum temperature range,germination rate of Picea mongolica was higher than that of Pinussylvesiris var.mongolica,and germination was more tidy.How ever,Pinussylvesiris var.mongolica grew faster than Picea mongolica,and the former was more resistant to high temperature than the latter.