To improve the artificial afforestation benefit, and to provide the way of selecting highly efficiency multi-storied mixed forest and the afforestation techniques for greening the bare beach land, some of multi-storied mixed forest types were investigated in the paper. The results showed that there were mainly three kinds of mixed forest types presently as follows: ①the conifer and broad-leaf multi-storied forest type, confier species such as Pinus massonisns mixed Pterocarya stenoptera，Liquidambar formosana，Schim，Phyllostachys heteroclada，Cyclobalanopsis glauca or Castanopsis sclerophylla. ②the broad-leaf multi-storied mixed forest type, such as Cinnamomum camphora，Schima，Cyclobalanopsis glauca，Castanopsis sclerophylla，Liquidambar formosana，Ulmus pumila and Zelkova serrate as the dominant species. ③the agroforestry type, with the defoliation trees like poplar、Alnus cremastogyn mixed the high economical trees such as Chinese chestnut，Phyllostachys propinqua，Toona sinensis and Ginkgo biloba.
Based on the investigation result of three mixed forest types, ie, poplar mixed Alnus cremastogyn forest，multi-storied poplar mixed defoliation trees forest and multi-storied poplar mixed with evergreen trees forest, it was showed that in five-year of multi-storied poplar mixed Alnus cremastogyn forest, the growth amount of poplar was the same as that of the pure forest, the growth amount of Alnus cremastogyn in belt-mixed forest was higher than that of pure forest. However，the growth amount of Alnus cremastogyn in mixed forest was significantly reduced. In three-year of multi-storied forest poplar mixed with defoliation trees, eight tested species were not negatively affected by the flood, and the poplar mixed defoliation community was primarily closed and grew very well. In two-year of multi-storied forest poplar mixed evergreen, the afforestation survival ratio of seven species, such as Cupressus Lusitanica，Biota orientalis，Cinnamomum camphora etc, was more than 90%, and grew very well. On the contrary，the afforestation survival ratio and growth of two species, Elaeocarpus sylvestris and Ligustrum lucidum, was not good because of misusing herbicide.