The direct melting polycondensation methods along with the improved process of catalysts,dehydration,nitrogen and vacuum pressure were adopted to synthesize the biodegradable material of poly(lactic acid)(PLA) from lactic acid.

A probe into direct financing、indirect financing and the objective model of financing structure in China;

Direct financing and indirect financing are important equally;

The Research of Financing Method for Real Estate Based on Direct Financing;

Financial innovation has deeply restructured modern financial system,traditional dichotomy of direct finance and indirect finance has lost power to recapitulate financial system,(and it s) necessary to reclassify modern financial system.

By analyzing the financing market characteristics of medium-and-small-sized enterprises and the deeper reasons for their "hard-to-finance",This article makes a study of medium-and-small-sized enterprises direct finance models and indirect finance models,Finally pointing out that faced with the fierce competition in the financing market,only by opening up more financing channels can medium-an.

Traditional financial theories regarded financial markets and financial intermediaries as two competitive and alternative institutions, thus categorizing all financial activities as direct or indirect finance only from the perspective of financial intermediaries .