This paper considers the choice of the complementary technology strategy between two OEMs competing in the market.\ Both OEMs master one of the complementary technologies, and the R&D capabilities of the two are heterogeneous.\ However, the production of their products requires the combination of two complementary technologies.\ For the specific technology that they lack, this paper constructs three technology strategy choice models of OEMs (i.e., outsourcing, independent development, and cross-licensing).\ The optimal strategy choice scheme of the OEMs is identified by comparing the equilibrium results in the three situations.\ This research shows: When the OEM with a technological advantage chooses technology outsourcing, innovation is always inhibited; however, if it has a strong R&D capability, outsourcing is more advantageous than independent development.Only when the licensing level of the more capable party is low and the licensing level of the less capable party is moderate, the two OEMs prefer independent development and will give up cross-licensing.Compared with technology outsourcing, the technology-leading OEM has a more positive attitude towards cross-licensing and vice versa.OEM's technology strategy preference depends on technological innovation capability difference and cross-licensing effect, and only independent development or cross-licensing can be the optimal strategy for both OEMs, while technology outsourcing cannot.