As a complex high-composite software concept

the trustworthiness research has failed to make substantial progress and breakthroughs during these decades. After analyzing the authority definitions of trustworthiness

this paper demonstrates that the scope of them is contradictory and incompatible. It further illustrates that the research of software trustworthiness conceptual model from its essence is very important and necessary. The term "trustworthiness" originates from sociology; so we should discuss the essence of software trustworthiness based on trust-theory of sociology. This paper constructs a trust system model STM based on hundreds of classical sociological literature on trust-theory. After comparing and mapping with software trust system

the paper proposes a software trustworthiness conceptual model STCM based on trust theory of sociology. Based on STM and STCM

a complete concept definition system of software trustworthiness is presented. Finally

STCM is proved to be feasible and effective by the measurement and evaluation experiment

which provides a new research direction for the advancement of software trustworthiness.