Based on the division of stand types and the establishment of aboveground part species indicator system through factor analysis, the existing artificial mixed plantations of Cunninghamia lanceolata in Sichuan basin were treated as study objects. Through the method of principal component analysis, the comprehensive evaluation function of soil aluminum toxicity was established. Then applying the canonical correlation analysis, the correlation between the two variables of tree species and soil aluminum toxicity was researched. The results showed that the artificial mixed plantations of Cunninghamia lanceolata could be divided into six stand types,in which the ones composed by Cunninghamia lanceolata only, by Cunninghamia lanceolata and Cryptomeria fortune and by Cunninghamia lanceolata and Camellia sinensis still suffered from soil aluminum toxicity, the growing of Cunninghamia lanceolata was worse. While the ones composed mainly by Cunninghamia lanceolata and Schima superb mixed with some deciduous species such as Quercus(Castanea), Paulownia tomentosa, Alnus cremastogyne and Sassafras tzumu had not suffered from soil aluminum toxicity or the soil aluminum toxicity in these stands had been reduced in different degrees because of the increasing of soil pH and Ca contents as well as the decreasing of soil Al contents, the growing of Cunninghamia lanceolata became better. Moreover, these tree species such as Schima superba, Phyllostachys heterocycla, Alnus cremastogyne, Sassafras tzumu, Machilus grijsii, Cinnamomum camphora, Cercidiphyllum japonicum and Cyclobalanopsis glauca had great effect on the remission of aluminum toxicity. While Camellia sinensis and Cryptomeria fortune should not be planted together with artificial plantation of Cunninghamia lanceolata from the perspective of alleviating aluminum toxicity.