Abstract: This article mainly discussed the feasibility and suitable environment of the mixed forests of Phyllostachys edulis and Chimonobambusa species. By comparing the suitable environment of Phyllostachys edulis and Chimonobambusa Species with the ecological environment of Junlian County, Yibin City, it was showed that the suitable altitude of Phyllostachys edulis and Chimonobambusa species mixed forests in subtropical region was 600-1 000 m; the soil pH was 4.7-7.0, the soil was loose and moist, preferably loam or sandy loam rich in organic matter, with a thickness of more than 80 cm. The annual precipitation of the plot was more than 800 mm, the precipitation in April was about 100 mm, the precipitation from early April to early June was about 400 mm, and the precipitation in July, August and September was more than 100 mm in a single month. The average annual temperature was 12-16℃, the average temperature in January was 4-8℃, the extreme low temperature was above -17℃, and the average temperature in July was 16-25℃. It was foggy all year round and the humidity was above 80%.The plots that meet the above conditions can be considered for the construction of mixed forests of Phyllostachys edulis and Chimonobambusa species. At the same time, in Junlian County, Yibin City, it can also been considered to plant Chimonobambusa under Phyllostachys edulis forests at an altitude of 600-1 000 m, so as to further increase the production of bamboo materials, bamboo shoots and other bamboo raw materials without occupying other land resources, and to generate income for local bamboo farmers.