Purpose:　To　optimize　treatment　schemes　using　2450-MHz　microwave　ablation　(MWA),　a　novel　conformal　coverage　method　based　on　bipolar-angle　mapping　is　proposed　that　determines　whether　a　liver　tumor　is　completely　encompassed　by　thermal　coagulation　zones.　Materials　and　methods:　Firstly,　three-dimensional　(3-D)　triangular　mesh　data　of　liver　tumors　were　reconstructed　from　clinical　computed　tomography　(CT)　slices　using　the　Marching　cubes　(MC)　algorithm.　Secondly,　characterization　models　of　thermal　coagulation　zones　were　established　based　on　finite　element　simulation　results　of　40,　45,　50,　55,　and　60W　ablations.　Finally,　coagulation　zone　models　and　tumor　surface　data　were　mapped　and　fused　on　a　two-dimensional　(2-D)　plane　to　achieve　conformal　coverage　of　liver　tumors　by　comparing　the　corresponding　polar　radii.　Results:　Optimal　parameters　for　ablation　treatment　of　liver　tumors　were　efficiently　obtained　with　the　proposed　conformal　coverage　method.　Fifteen　liver　tumors　were　obtained　with　maximal　diameters　of　12.329-78.612mm　(mean　+/-　standard　deviation,　39.094　+/-　19.447mm).　The　insertion　positions　and　orientations　of　the　MWA　antenna　were　determined　based　on　3-D　reconstruction　results　of　these　tumors.　The　ablation　patterns　and　durations　of　tumors　were　planned　according　to　the　minimum　mean　standard　deviations　between　the　ablative　margin　and　tumor　surface.　Conclusion:　The　proposed　method　can　be　applied　to　computer-assisted　MWA　treatment　planning　of　liver　tumors,　and　is　expected　to　guide　clinical　procedures　in　future.