Abstract: Efforts have generally been made from policy considerations to interpret reasons for the proposition of the Belt and Road Initiative and its global layout. Though they are of some significance, such a grand initiative certainly has its own internal theoretical basis. This paper is in the opinion that the spillover effect of oversized economy, the extension of the value chain and its climbing effect, as well as channel suitability and location orientation constitute the endogenous driving forces of the Belt and Road Initiative. Each of the three theoretical perspectives has its own internal realistic basis,all of which may offer some reference that is conducive to understanding the practice and future development of the Belt and Road Initiative. Full text available here.