本文利用同工酶电泳方法，研究了天目山银杏群体的遗传变异性，计算了4种同工酶(GDH，G-6PDH，PRX，SDH)8个位点上的等位基因频率和每个位点的平均杂合率。结果表明：天目山银杏群体的遗传变异性较小，各位点的平均杂合率仅为0.150±0.004，呈现较大程度的遗传同一性，因此认为天目山银杏很可能是僧人在寺庙旁栽植的银杏留下的后代。

The genetic variation of Ginkgo biloba L. population in Tian-Mu Mountain was studied by means of isozyme analysis. Forty trees were sampled from the population as representatives. Allele frequency at eight loci of four isozymes (GDH , G- 6PDH , PRX, SDH) and average heterozygosity per locus were calculated. The average heterozygosity of 0. 150±0. 004 per locus indicata that there were less genetic variation and greater genetic identity in Ginkgo biloba L.population of Tian-Mu Mountain. It is considered that the trees are very likely the offspring of plants that were cultivated in the vicinity of the old temple by resident monks.