Abstract:Abstract: Wild Rhododendron mucronulatum has a good characteristics of cold-resistance, early flowering, bloom-heavily and highly ornamental value, but was rarely applied in the landscape gardens. This study aims to investigate the distribution of wild R. mucronulatum resources, which may provide a rational scientific basis for the utilization of it. In this paper, the wild R. mucronulatum were used as materials, the germplasm resources of five mountains (Yashan, Kunyushan Wulianshan, Jiuxianshan, Laoshan) in Jiaodong Peninsula had been aborative surveyed by sampling method. The distribution ranges, population sizes, growth conditions and ecological habits of R. mucronulatum had been elaborately recorded. In addition, the physical and chemical properties of mountain soil were also examined. These results indicated that R. mucronulatum had a widely distribution on altitude and good adaptability to the environment, which is located between 100 m and 1100 m and can be found in several diversity regions, such as the sunny slope, shade slope, mountain top, valley and the chink of the rocks, especially in the shade slope ones. Various accompanying plants together with the R. mucronulatum comprising the steady community. The R. mucronulatum blossomed early and had heavily flower productivity. Additionally, the flower color altered significantly even in the same red-purple strains. It has a bigger differences in terms of plant height, breadth and numbers of flowers, but smaller difference in the diameter of the flower. Otherwise, the pH of the surveyed mountain acid soil is mostly the same, except for the soil organic and the content of nitrogen, phosphorus and potassium.