在信託法下之規範設計，本質上是針對非營業信託或個別信託所建構之民事信託法理，惟相對地，商事信託則具有營業性、集團性或商品性，原則上雖植基於傳統民事信託法理，但每因其商業目的或功能設計之需要，勢必應就信託當事人之權利義務關係及信託之實質構造，加以適度地調整或修正，乃至於建構符合信託業務發展需要之商事信託法理。本文乃從商事信託之基本概念出發，除就商事信託之意義及特性加以分析，探討民事信託與商事信託之法理差異外，並以信託之經濟及社會功能為思考基礎，參酌我國信託業務之發展現況，嘗試將商事信託分為資產管理型、吸收存款型、資金運用型、資產轉換型及事業經營型等五種類型，期能拓深商事信託之基礎理論。 另鑑於行政院版「金融資產證券化條例草案」引進所謂特殊目的信託制度，以作為金融資產證券化之導管體，且由於特殊目的信託具有營業性、商品性及集團性等商亭信託之特質，顯與傳統上之非營業性或個別性之民事信託有所差異，故為能深入分析商事信託之法理內涵，本文尚以特殊目的信託為主要探討對象，並參考日本「資產流動化法」上所規定之「特定目的信託制度」，分別從特殊目的信託之設定、受益權之證券化、受益人之權利行使及保護、受託人之權利義務、特殊目的信託之變更與消滅，乃至於特殊目的信託之監督等角度，逐一說明及檢討我國現行信託法相關規定適用之界限及問題，除期能正確掌握特殊目的信託之應有法制構造，而就特殊目的信託無法一概適用民事信託法理之問題加以具體呈現外，並進一步思考如何妥適調整傳統之民事信託法理，而使民事信託法理與商事信託法理得以順利接軌。

　　　　　The legal system of the Trust Law is not set up for the "business trust" but for the "respective trust", the purpose of the Trust Law is to construct the jurisprudence of "civil trust" in nature. In the contrary, "commercial trust" has its' merchant, collective and occupational essence. Although the Trust Law originates from the traditional civil trust, in order to meet the needs of its' commercial purpose and functional design it cannot reject to adjust or modify the parties' relationship and substantial construction of the trust, even to construct the jurisprudence of commercial trust. This article not only analyzes the meaning and character of the commercial trust by its' fundamental concepts to discuss the differences between the civil trust and commercial trust but also divides the commercial trust into "assets management", "absorbing savings", "funds utilization", "assets transformation", "business management" five types from the economic and social function of the trust and development of Taiwan's trust business to deepen the basic theory of the commercial trust. In view of the introduction of the legal system of special purpose trust by Administrative Yuan in "Draft of the Financial Assets Securitization Act", it is serving as the conduit/intermediate of financial assets securitization. Due to the natures of commercial trust: business, merchandise and collectiveness, are different from the civil trust that is non-business and respectiveness. In order to analyze the commercial trust deeply, this article takes the "special purpose trust" as the predominant object. This article refers to "the legal system of special purpose trust" in Japan's "Assets Securitization Law", from the angle of the contract of special purpose trust, securitization of beneficial right, the protection and right of beneficiary, the legal relationships of the trustee, the variation and extinguishment of the special purpose trust and supervisory of special purpose trust to discuss and check the limitations and problems arriving from the application of the Trust Law. Expecting to understand the legal construction of the special purpose trust accurately, and to disclose the problem that the special purpose trust can't apply the jurisprudence of civil trust wholly. Furthermore, considering about how to adjust the jurisprudence of traditional civil trust to connect and harmonize the jurisprudence between civil trust and commercial trust.