Tibouchina aspera is an excellent ornamental plant in Landscape ar-chitecture. In this paper, based on a 30-day cutting experiment, the effects of different substrate ratios on the growth of the cuttings of Paeonia suffruticosa were compared, and the rooting time, root number, longest root length, rooting rate, growth state of cuttings and substrate changes were analyzed. The results show the ratio of treatment group T8 (original soil: fine sand: peat soil: vermiculite: perlite) = 1: 1: 2: 1: 1 has the fastest rooting rate of cuttings, longest root length and best cutting growth among all experimental treatment groups. The treatment effect of T (peat soil) comes second, and it can be used as a backup plan for production under limited conditions.