Abstract:In a “two-to-one” supply chain consisting of two manufacturers (one is a R&D manufacturer and the other is a non-R&D manufacturer) and a retailer, by considering horizontal technology spillover effects, a model of technology non-authorization and technology authorization (including royalty authorization and fixed fee authorization) models were constructed, then the R&D manufacturer’s optimal technology authorization strategy was given. Finally, the influence of the degree of technology spillover and product substitution on the model results were analyzed. The research shows that: (1) the optimal technology authorization strategy and the optimal authorization value of the R&D manufacturer mainly depend on the degree of product substitution and technology spillover; (2) under the royalty authorization (fixed fee authorization) strategy, the retailer's profit is always less (greater) than that under the technology non-authorization strategy; (3) when the degree of product substitution is small (large), the supply chain’s profit under the royalty authorization strategy is always greater (less) than that under the technology non-authorization strategy. Regardless of the degree of product substitution, the profit of the supply chain under the fixed fee authorization strategy is always greater than that under the technology non-authorization strategy.