Firstly, the author shows us her research on the partiality of songs of children in 5-6 years old.

This article proposes a curve,which is called investing preferred curve,to compensate the shortage of the traditional theory,and further analyzes and studies the movement and property of the asset combination curve and the variation law of individual portfolio and the inner mechanism on the basis of the preferred curve discussed in the first section.

Based on the Markowitz portfolio theory, an investment preferred curve is proposed and an approach to determining the optimal portfolio of a specific investor is designed by using the preferrd curve as its tool.

As one kind of precious course resource, the English songs and ballads are often ignored in elementary English teaching, which has deviated from the targets and requirements of the English Curriculum Standard and has affected students’ formation of language ability.