This paper expounds the concept and the important significance of the lower rent house trust fund,analyzes on the legal principle of the lower rent house trust fund,and based on this,advances some suggestions on relevant legal system construction.

This article mainly discuss some problems,such as capital scale,capital resource,system renewal and how utilize trust fund attracting the civilian capital.

It is a common difficult problem encountered by countries in the world that they must not only overcome the shortcomings due to difficult regulation,but also make full use of the advantages of efficient property management of trust fund.

The risks and profits of the joint fund are analyzed.

Through analyaing the origin of the problem existing in stock market of the nation,the author puts forward a suppostion to return and develop common fund to push the stock market forward and necessary measures should be taken.