The purpose of the study is to discuss the Engineer¡¦s working Passion and detects the inner meaning by way of inquiring senior engineering managers firstly. In this research, the inner meanings are applied to developing the framework and questionary. The inquiry result is that working passion¡¦s sources affect working passion¡¦s behaviors, and working passion behaviors bring working passion effect. In this study, working passion source is defined as independent variable, working passion effect is defined as dependent variable, and working passion behavior is defined as a mediator. Furthermore, person-organization fit and person-job fit are defined as interfered variables. The thesis adopted questionnaire survey and target on R&D dept. engineers in Taiwan high-technology industry. 388 copies of the 450 questionnaires issued are returned, among which 369 copies are valid. The data were analyzed by reliability analysis, factor analysis, one-way ANOVA, hierarchical regression and Canonical correlation analysis to discuss the relationships. The findings of the study are as follows. (1) A positive relationship between the working passion sources and the working passion effects. (2) A positive relationship between the working passion behaviors and the working passion effects. (3) Working passion behaviors mediate the relationship between the working passion sources and the working passion effects. (4) Person-organization fit and person-job fit interfere in each other variables. The more person-organization fit, the more motivation and leadership result in working passion behaviors. The more person-job fit, the more leadership and team birr bring working passion behaviors.