Abstract: Structural Equation Modeling (SEM) has been extensively applied in education and psychology. But there are still some questions on theory and technique that needs to be explicated. Many researchers themselves are not acquainted with SEM. So there are many misapplications about SEM and many error explications about the results. Therefore, this article included three parts. First we discussed some questions about the design and estimate of SEM. Second we indicated some recent developments of SEM and some new applications of SEM in some domains. Lastly we summarized the deficiency of SEM.

Key words: Structural Equation Modeling,measurement modeling,structural modeling,fitness indix, portrait design.