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通过楸树１０个无性系及金丝楸（对照）测试林５年对比试验，选出速生型优良无性系８６１５。５年生胸径达９．４ｃｍ，年均１．８８ｃｍ；树高５．２ｍ，年均１．０４ｍ；立木材积０．０１７１４ｍ￣３，年均０．００３４３ｍ￣３。与金丝楸相比，胸径、树高、立木材积分别增力０２７．０％、６．１％及１０２．８％。与全林均值相比，胸径、树高、立木材积分别增加２５．３％、１０．６％及９２．２％。胸径重复力为５４．７１％，遗传增益１３．８６％；树高重复力３５．０５％，遗传增益３．７３％；立木材积重复力６１．３７％，遗传增益５６．５５％。
Five clones of Catalpa bungei and Catalpa bungei (control) were used to compare the five-year comparative test to select the fast-growing elite clones 8615. The 5-year-old DBH reached 9.4cm with an annual average of 1.88cm and tree height of 5.2m, Average annual 1.04m; stand timber volume 0.01714m ~ 3, an average of 0.00343m ~ 3. Compared with the golden catalpa, DBH, tree height, stand volume increased by 027.0%, 6.1% and 102.8% respectively. The DBH, tree height and stand volume increased by 25.3%, 10.6% and 92.2% respectively compared with the average forest stand. The DBH repetitive force was 54.71%, the genetic gain was 13.86%. The tree height repeatability force was 35.05%, the genetic gain was 3.73%. The timber weight was 61.37% and the genetic gain was 56.55%.