Abstract: Different kinds and mass concentrations of plant growth regulators were used to deal with the cuttings of Crateva unilocularis, in order to know the cutting mechanism and to screen out the growth regulator and concentration ratio for the propagation of the C.unilocularis, so as to provide a real and feasible scientific basis for the expansion propagation and production of C.unilocularis. By taking C.unilocularis annual branches as materials, orthogonal test was conducted with three kinds of plant growth regulator(IAA, NAA, ABT-1) in three kinds of different mass concentration, and water treatment(CK) was kept as contrast, cutting three months after the shoot growth and root traits(longest rooting rate, root volume, root length, average root length, etc.) were measured and comprehensively analyzed. The test screening of C.unilocularis cuttings, the optimal scheme for A1B2C2, namely ABT1 mass concentration of 50 mg·L^-1, mass concentration of 200 mg·L^-1 NAA, IAA concentration of 200 mg·L^-1, the rooting rate(83.33%), average root length(24.03 mm), the longest root length(46.13 mm), the average root number(24), root effect index(19.06) for CK 2.27 times, 2.97 times and 3.03 times, 4.50 times and 12.79 times, The root system was well developed. The rooting ability of C.unilocularis can be significantly increased by mixing different plant growth regulators at the appropriate concentration, thus accelerating the growth and increasing the rooting rate of cuttings.

Key words: Crateva unilocularis, cuttings, take root, growth regulator, root effect index