This part analyzes the theory soil and evolution process of the system of the third persons infracting rights of obligee , indicating that the cause and evolution of this system results from the necessary demand of development of many theories from seven aspects , such as emergence of efficiency breach theory , whether the rights of obligee could be the object of tort as well as the integration and obliquity between tort obligation and breach obligation 本部分对第三人侵害债权制度产生的理论土壤和其演进过程做了重点分析，从7个方面说明了此制度的产生及演进是许多理论的发展所必然要求的。比如效率违约论的出现、债权能否成为侵权对象的争论以及侵权责任与违约责任的融合与交叉等等。
