In order to effectively enhance the comprehensive defense capability of offshore islands and reefs and the surrounding waters, a method of geographic information support requirements analysis for offshore islands and reefs defense based on HOQ is proposed. According to the operational requirements of offshore reef defense, the quality house technology (HOQ) is used to quantitatively analyze the geographic information support requirements of offshore reef defense, establish the relationship between operational requirements and geographic information support requirements, realize the combination of qualitative and quantitative analysis of support requirements, and improve the accuracy of demand analysis. Finally, the quantitative analysis conclusion of geographic information support demand degree is obtained. The results show that this method can provide reference for the analysis of geographic information support requirements of various combat operations.