This study takes Tonganosaurus hei (Li et al., 2010) as an example to introduce a new method of sauropod dinosaurs, quantitative systematic paleontology and its application in determinig the Phylogenetic position of new sauropod dinosaur fossil materials. There are four links in this method: compiling and revising the statement repertory, setting up the data base, software analysis and result analysis. Among them, compiling and revising the statement repertory is the key link and needs to be complemented and improved based on the fossil material in order that no features have been omitted. Thus they are of the same weigth in accordance with its importance. Then evolutional relationship of Jurassic long neck sauropod dinosaur in the Sichuan Basin was analysed by this new method. The result shows the quantitative systematic paleontology has the advantages of objective, fast and all sided. Most importantly，the result of the quantitative systematic paleontology is in agreement to that of traditional qualitative configuration analysis, indicating this method is of supplementation and check to qualitative analysis method.