Abstract: After one year of co cultivation with Pistacia weinmannifolia, Artemisia scoparia, Alnus ferdinandi-coburgii , and M. oleifera, the effects of different host plants on growth indicators such as height and ground diameter, biomass allocation, and chlorophyll content of M. oleifera seedlings were measured and analyzed, and the quality of seedlings was evaluated based on this. The results showed that the M. oleifera showed obvious host preference in the experiment. After one year of co-cultivation of A. scoparia and M. oleifera, the seedlings of M. oleifera reached a height of 77.5 cm, a ground diameter of 13.69 mm, a leaf area of 51.47 cm², and an average of 8.33 primary roots, with an average primary root length of 28.91 cm, 27.0 suckers, and a single plant biomass of 27.14 g, showing a significant difference from the single plant cultivation treatment(P < 0.01). At the same time, when A. scoparia was the host, its aboveground distribution ratio was 51.08%, and the aboveground and underground parts of the entire plant showed a balanced development trend. The root stem ratio, root shoot ratio , and root leaf ratio increased compared to single plant planting, while the non photosynthetic organ to photosynthetic organ ratio decreased. This also indicates that M. oleifera can better utilize the host to provide nutrients for its own growth and development. Different host plants have a significant impact on the chlorophyll content of M. oleifera, indicating that the host can greatly affect its photosynthesis, but does not play a dominant role in the development of M. oleifera. The quality index of seedlings shows that when A. scoparia is the host plant, the QI is 4.36, indicating the best quality of seedlings.