Multithread technology has got extensive development in applications for recen t years, it is important to get a full analysis of this technology. This paper i ntroduces basic fault patterns of multithread program, and then summarizes sev eral algorithms for multithread program analysis along with comparison of thei r advantages and limits. These multithread program analysis benefit a lot for the formulation of the new testing tools, and will promote the development of so ftware testing in multithread technology field.