diff --git a/libopenfpga/librepackdc/src/read_xml_repack_design_constraints.cpp b/libopenfpga/librepackdc/src/read_xml_repack_design_constraints.cpp
new file mode 100644
index 000000000..d6c5eb8aa
--- /dev/null
+++ b/libopenfpga/librepackdc/src/read_xml_repack_design_constraints.cpp
@@ -0,0 +1,94 @@
+/********************************************************************
+ * This file includes the top-level function of this library
+ * which reads an XML of a fabric key to the associated
+ * data structures
+ *******************************************************************/
+#include <string>
+
+/* Headers from pugi XML library */
+#include "pugixml.hpp"
+#include "pugixml_util.hpp"
+
+/* Headers from vtr util library */
+#include "vtr_assert.h"
+#include "vtr_time.h"
+
+/* Headers from libopenfpga util library */
+#include "openfpga_port_parser.h"
+
+/* Headers from libarchfpga */
+#include "arch_error.h"
+#include "read_xml_util.h"
+
+#include "read_xml_repack_design_constraints.h"
+
+/********************************************************************
+ * Parse XML codes of a <key> to an object of FabricKey
+ *******************************************************************/
+static 
+void read_xml_pin_constraint(pugi::xml_node& xml_pin_constraint,
+                             const pugiutil::loc_data& loc_data,
+                             RepackDesignConstraints& repack_design_constraints) {
+
+  /* Create a new design constraint in the storage */
+  RepackDesignConstraintId design_constraint_id = repack_design_constraints.create_design_constraint(RepackDesignConstraints::PIN_ASSIGNMENT);
+
+  if (false == repack_design_constraints.valid_design_constraint_id(design_constraint_id)) {
+    archfpga_throw(loc_data.filename_c_str(), loc_data.line(xml_pin_constraint),
+                   "Fail to create design constraint!\n");
+  }
+
+  repack_design_constraints.set_tile(design_constraint_id,
+                                     get_attribute(xml_pin_constraint, "tile", loc_data).as_string());
+
+  repack_design_constraints.set_tile_coordinate(design_constraint_id,
+                                                get_attribute(xml_pin_constraint, "x", loc_data, pugiutil::ReqOpt::OPTIONAL).as_int(-1),
+                                                get_attribute(xml_pin_constraint, "y", loc_data, pugiutil::ReqOpt::OPTIONAL).as_int(-1));
+
+
+  openfpga::PortParser port_parser(get_attribute(xml_pin_constraint, "pin", loc_data).as_string());
+
+  repack_design_constraints.set_pin(design_constraint_id,
+                                    port_parser.port());
+
+  repack_design_constraints.set_net(design_constraint_id,
+                                    get_attribute(xml_pin_constraint, "net", loc_data).as_string());
+}
+
+/********************************************************************
+ * Parse XML codes about <repack_design_constraints> to an object of RepackDesignConstraints
+ *******************************************************************/
+RepackDesignConstraints read_xml_repack_design_constraints(const char* design_constraint_fname) {
+
+  vtr::ScopedStartFinishTimer timer("Read Repack Design Constraints");
+
+  RepackDesignConstraints repack_design_constraints;
+
+  /* Parse the file */
+  pugi::xml_document doc;
+  pugiutil::loc_data loc_data;
+
+  try {
+    loc_data = pugiutil::load_xml(doc, design_constraint_fname);
+
+    pugi::xml_node xml_root = get_single_child(doc, "repack_design_constraint", loc_data);
+
+    size_t num_design_constraintss = std::distance(xml_root.children().begin(), xml_root.children().end());
+    /* Reserve memory space for the region */
+    fabric_key.reserve_design_constraints(num_design_constraints);
+
+    for (pugi::xml_node xml_design_constraint : xml_root.children()) {
+      /* Error out if the XML child has an invalid name! */
+      if (xml_design_constraint.name() != std::string("pin_constraint")) {
+        bad_tag(xml_design_constraint, loc_data, xml_root, {"pin_constraint"});
+      }
+      read_xml_pin_constraint(xml_design_constraint, loc_data, repack_design_constraints);
+    } 
+  } catch (pugiutil::XmlError& e) {
+    archfpga_throw(design_constraint_fname, e.line(),
+                   "%s", e.what());
+  }
+
+  return fabric_key; 
+}
+
diff --git a/libopenfpga/librepackdc/src/read_xml_repack_design_constraints.h b/libopenfpga/librepackdc/src/read_xml_repack_design_constraints.h
new file mode 100644
index 000000000..c2d3917b2
--- /dev/null
+++ b/libopenfpga/librepackdc/src/read_xml_repack_design_constraints.h
@@ -0,0 +1,16 @@
+#ifndef READ_XML_REPACK_DESIGN_CONSTRAINTS_H
+#define READ_XML_REPACK_DESIGN_CONSTRAINTS_H
+
+/********************************************************************
+ * Include header files that are required by function declaration
+ *******************************************************************/
+#include "pugixml_util.hpp"
+#include "pugixml.hpp"
+#include "repack_design_constraints.h"
+
+/********************************************************************
+ * Function declaration
+ *******************************************************************/
+RepackDesignConstraints read_xml_repack_design_constraints(const char* design_constraint_fname);
+
+#endif