diff --git a/include/ufo/ufo.hpp b/include/ufo/ufo.hpp
index 36ca956..ceb16e9 100644
--- a/include/ufo/ufo.hpp
+++ b/include/ufo/ufo.hpp
@@ -30,8 +30,12 @@ namespace Eigen
 {
   constexpr inline auto serialize(auto & archive, Eigen::Matrix3d& matrix)
     { return archive(std::span(matrix.data(), matrix.size())); }
+  constexpr inline auto serialize(auto & archive, const Eigen::Matrix3d& matrix)
+    { return archive(std::span(matrix.data(), matrix.size())); }
   constexpr inline auto serialize(auto & archive, Eigen::Vector3d& vector)
     { return archive(std::span(vector.data(), vector.size())); }
+  constexpr inline auto serialize(auto & archive, const Eigen::Vector3d& vector)
+    { return archive(std::span(vector.data(), vector.size())); }
 }
 
 // 在相位中, 约定为使用 $\exp (2 \pi i \vec{q} \cdot \vec{r})$ 来表示原子的运动状态
@@ -138,7 +142,7 @@ struct Output
   };
   std::vector<QPointDataType_> QPointData;
 
-  void write(std::string filename, std::string format, unsigned percision = 10);
+  void write(std::string filename, std::string format, unsigned percision = 10) const;
   Output() = default;
   Output(std::string filename);
 
diff --git a/include/ufo/ufo.impl.hpp b/include/ufo/ufo.impl.hpp
index eb0dbb7..105c4e7 100644
--- a/include/ufo/ufo.impl.hpp
+++ b/include/ufo/ufo.impl.hpp
@@ -102,7 +102,6 @@ inline Input::Input(std::string filename)
     QPointData.resize(phonon.size());
     for (unsigned i = 0; i < phonon.size(); i++)
     {
-      QPointData[i].QPoint.resize(3);
       for (unsigned j = 0; j < 3; j++)
         QPointData[i].QPoint(j) = phonon[i]["q-position"][j].as<double>();
       auto band = phonon[i]["band"].as<std::vector<YAML::Node>>();
@@ -158,7 +157,7 @@ inline Input::Input(std::string filename)
   }
 }
 
-inline void Output::write(std::string filename, std::string format, unsigned percision)
+inline void Output::write(std::string filename, std::string format, unsigned percision) const
 {
   if (format == "yaml")
     std::ofstream(filename) << [&]
@@ -230,7 +229,7 @@ inline void Output::write(std::string filename, std::string format, unsigned per
     static_assert(sizeof(char) == sizeof(std::byte));
     std::ofstream file(filename, std::ios::binary | std::ios::out);
     file.exceptions(std::ios::badbit | std::ios::failbit);
-    file.write(reinterpret_cast<char*>(data.data()), data.size());
+    file.write(reinterpret_cast<const char*>(data.data()), data.size());
   }
 }
 
diff --git a/test/14.2.2.yaml b/test/14.2.2.yaml
index 95b59b6..f1aff17 100644
--- a/test/14.2.2.yaml
+++ b/test/14.2.2.yaml
@@ -7,6 +7,6 @@ PrimativeCellBasisNumber: [ 8, 8, 8 ]
 AtomPositionInputFile: { FileName: "/home/chn/Documents/lammps-SiC/14/14.2/14.2.2/14.2.2.4/band.yaml", Format: "yaml" }
 QPointDataInputFile: { FileName: "/home/chn/Documents/lammps-SiC/14/14.2/14.2.2/14.2.2.4/band.yaml", Format: "yaml" }
 QPointDataOutputFile:
-- { FileName: "test/14.2.2.result.yaml", Format: "yaml-human-readable" }
+- { FileName: "test/14.2.2.result.yaml", Format: "yaml" }
 - { FileName: "test/14.2.2.result.human-readable.yaml", Format: "yaml-human-readable" }
 - { FileName: "test/14.2.2.result.zpp", Format: "zpp" }