This article examines contemporary China-Iran relations, focusing on the economic and strategic ties that have helped solidify the relationship since 1979. We begin with an overview of the arms and technology transfers that mark the early years of the relationship, analyzing the benefits each side gained from these transactions. In addition to discussing the short-term financial benefits behind forging stronger ties, we examine how the regional ascent of both states has also presented several long term factors that helped motivate their cooperation. These developments shed light on the important role the U.S. has played, both in terms of where it has tried to intervene and what success it has had influencing the Sino-Iranian relationship.