In this paper, firstly, we will study the structure of the path complex $(Ω_*(G;\Z),\partial)$ of a digraph $G$ via the $\Z$-generators of $Ω_*(G,\Z)$ under strongly regular condition, which is called the minimal path in \cite{HY}. In particular, we will study various examples of the minimal $3$-paths. Secondly, we will show that the supporting sub-digraph of minimal path has acyclic path homologies. Thirdly, we will consider the applications of such an acyclic model.