l heydarzadeh kashani - Department of Mathematics, University of Tafresh
m ramezani - Department of Mathematics, Tafresh University , Tehran Ave ,University of Mazandaran, Babolsar, Iran
d.a mojdeh - Department of Mathematics, Tafresh University , Tehran Ave ,University of Mazandaran, Babolsar, Iran

In this paper, we show how graph theory can check necessary and sufficient conditions the basis for controllability of structural positive bilinear systems These conditions are one way simplify to check by hand for small systems and so we can use for large scale systems by means well-known combinatorial techniques

Positive bilinear systems, Controllability, graph theory