This　paper　presents　an　efficient　electromagnetic　(EM)　optimization　method　with　adjoint-sensitivity-based　multifeature　surrogate　for　the　design　of　microwave　filters.　This　method　is　designed　to　solve　the　EM　optimization　problem　where　the　starting　point　is　far　from　the　design　specifications.　Feature　sensitivities　are　incorporated　into　the　multifeatured　surrogate　modeling　to　achieve　a　surrogate　with　higher　accuracy　compared　to　the　existing　methods　during　the　EM　optimization　process.　A　new　design　objective　function　in　the　feature　space　is　also　utilized　to　improve　the　speed　of　multifeature　surrogate　optimization.　A　microwave　filter　example　is　presented　to　illustrate　this　optimization　method.　　©　2024　IEEE.