We studied the salt-tolerant germination of birch seed introduced from abroad and used 0, 0.2%, 0.4%, 0.6%, 0.8% and 1% of NaCl solution to deal with 26 families of birch seed. Experimental results showed that as NaCl concentrations increasing, the germination energy, index of germination and germination percentage of all families of birch seed were all decline, initial germination time and mean time to germination were increasing. Different families of seed germination respond differently to NaCl stress. Seeing from the results of the experimental analysis, we know 7th, 8th, 10th, 16th, 20th, 22th, 24th families of seed germination were better, and those families’ salt-tolerance were stronger than 26th and other families of birch seed.