Path coefficient is a statistic of causality between correlation coefficients. It is not only affected by the variation degree of measurement units and independent variables, but also can distinguish the direct and indirect effects of independent variables on dependent variables, so it has been widely used. This paper focuses on the whole process of deriving the mathematical formula of pathanalysis. Referring to the matrix algorithm which is convenient for computer program implementation, the path analysis is run in Python language. The parameters and application conditions of the analysis results are explained.