diff --git a/openfpga/src/repack/build_physical_lb_rr_graph.cpp b/openfpga/src/repack/build_physical_lb_rr_graph.cpp
index aca8cb0d1..e79985082 100644
--- a/openfpga/src/repack/build_physical_lb_rr_graph.cpp
+++ b/openfpga/src/repack/build_physical_lb_rr_graph.cpp
@@ -395,6 +395,13 @@ void build_physical_lb_rr_graphs(const DeviceContext& device_ctx,
              lb_type.pb_graph_head->pb_type->name);
 
     const LbRRGraph& lb_rr_graph = build_lb_type_physical_lb_rr_graph(lb_type.pb_graph_head, const_cast<const VprDeviceAnnotation&>(device_annotation), verbose); 
+    /* Check the rr_graph */
+    if (false == lb_rr_graph.validate()) {
+      exit(1);
+    }
+    VTR_LOGV(verbose, 
+             "Check routing resource graph for logical tile passed\n");
+
     device_annotation.add_physical_lb_rr_graph(lb_type.pb_graph_head, lb_rr_graph);
   }
 
diff --git a/openfpga/src/repack/lb_rr_graph.cpp b/openfpga/src/repack/lb_rr_graph.cpp
index 434ac0b3e..db43543da 100644
--- a/openfpga/src/repack/lb_rr_graph.cpp
+++ b/openfpga/src/repack/lb_rr_graph.cpp
@@ -262,4 +262,195 @@ bool LbRRGraph::valid_edge_id(const LbRREdgeId& edge_id) const {
   return ( size_t(edge_id) < edge_ids_.size() ) && ( edge_id == edge_ids_[edge_id] ); 
 }
 
+/* This function run fundamental checks on internal data 
+ * Errors are thrown if fundamental checking fails
+ */
+bool LbRRGraph::validate() const {
+  size_t num_err = 0;
+
+  /* Validate the sizes of nodes and node-related vectors 
+   * Validate the sizes of edges and edge-related vectors 
+   */
+  if (false == validate_sizes()) {
+    VTR_LOG_WARN("Fail in validating node and edges sizes!\n");
+    num_err++;
+  }
+
+  /* Fundamental check */
+  if (false == validate_nodes_edges()) {
+    VTR_LOG_WARN("Fail in validating edges connected to each node!\n");
+    num_err++;
+  }
+
+  /* Error out if there is any fatal errors found */
+  if (0 < num_err) {
+    VTR_LOG_ERROR("Logical tile Routing Resource graph is not valid due to %d fatal errors !\n",
+                  num_err);
+  }
+
+  return (0 == num_err);
+}
+
+/******************************************************************************
+ * Private validators/invalidators
+ ******************************************************************************/
+bool LbRRGraph::validate_node_sizes() const {
+  size_t num_nodes = node_ids_.size();
+  return node_ids_.size() == num_nodes
+         && node_types_.size() == num_nodes
+         && node_capacities_.size() == num_nodes
+         && node_pb_graph_pins_.size() == num_nodes
+         && node_intrinsic_costs_.size() == num_nodes
+         && node_in_edges_.size() == num_nodes
+         && node_out_edges_.size() == num_nodes;
+}
+
+bool LbRRGraph::validate_edge_sizes() const {
+  size_t num_edges = edge_ids_.size();
+  return edge_src_nodes_.size() == num_edges
+         && edge_sink_nodes_.size() == num_edges
+         && edge_intrinsic_costs_.size() == num_edges
+         && edge_modes_.size() == num_edges;
+}
+
+bool LbRRGraph::validate_sizes() const {
+  return validate_node_sizes() && validate_edge_sizes(); 
+}
+
+/* Check if a node is in the list of source_nodes of a edge */
+bool LbRRGraph::validate_node_is_edge_src(const LbRRNodeId& node, const LbRREdgeId& edge) const {
+  /* Assure a valid node id */
+  VTR_ASSERT_SAFE(valid_node_id(node));
+  /* assure a valid edge id */
+  VTR_ASSERT_SAFE(valid_edge_id(edge));
+  /* find if the node is the src */
+  if (node == edge_src_node(edge)) {
+    return true; /* confirmed source node*/
+  } else {
+    return false; /* not a source */
+  }
+}
+
+/* Check if a node is in the list of sink_nodes of a edge */
+bool LbRRGraph::validate_node_is_edge_sink(const LbRRNodeId& node, const LbRREdgeId& edge) const {
+  /* Assure a valid node id */
+  VTR_ASSERT_SAFE(valid_node_id(node));
+  /* assure a valid edge id */
+  VTR_ASSERT_SAFE(valid_edge_id(edge));
+  /* find if the node is the sink */
+  if (node == edge_sink_node(edge)) {
+    return true; /* confirmed source node*/
+  } else {
+    return false; /* not a source */
+  }
+}
+/* This function will check if a node has valid input edges
+ * 1. Check the edge ids are valid
+ * 2. Check the node is in the list of edge_sink_node
+ */
+bool LbRRGraph::validate_node_in_edges(const LbRRNodeId& node) const {
+  bool all_valid = true;
+  /* Assure a valid node id */
+  VTR_ASSERT_SAFE(valid_node_id(node));
+  /* Check each edge */
+  for (auto edge : node_in_edges(node)) {
+      /* assure a valid edge id */
+      VTR_ASSERT_SAFE(valid_edge_id(edge));
+      /* check the node is in the list of edge_sink_node */
+      if (true == validate_node_is_edge_sink(node, edge)) {
+        continue;
+    }
+    /* Reach here, it means there is something wrong! 
+     * Print a warning  
+     */
+    VTR_LOG_WARN("Edge %d is in the input edge list of node %d while the node is not in edge's sink node list!\n",
+                  size_t(edge), size_t(node));
+    all_valid = false;
+  }
+
+  return all_valid;
+}
+
+/* This function will check if a node has valid output edges
+ * 1. Check the edge ids are valid
+ * 2. Check the node is in the list of edge_source_node
+ */
+bool LbRRGraph::validate_node_out_edges(const LbRRNodeId& node) const {
+  bool all_valid = true;
+  /* Assure a valid node id */
+  VTR_ASSERT_SAFE(valid_node_id(node));
+  /* Check each edge */
+  for (auto edge : node_out_edges(node)) {
+    /* assure a valid edge id */
+    VTR_ASSERT_SAFE(valid_edge_id(edge));
+    /* check the node is in the list of edge_sink_node */
+    if (true == validate_node_is_edge_src(node, edge)) {
+      continue;
+    }
+    /* Reach here, it means there is something wrong! 
+     * Print a warning  
+     */
+    VTR_LOG_WARN("Edge %d is in the output edge list of node %d while the node is not in edge's source node list!\n",
+                 size_t(edge), size_t(node));
+    all_valid = false;
+  }
+
+  return all_valid;
+}
+
+
+/* check if all the nodes' input edges are valid */
+bool LbRRGraph::validate_nodes_in_edges() const {
+  bool all_valid = true;
+  for (const LbRRNodeId& id : nodes()) {
+    /* Try to find if this is an invalid id or not */
+    if (!valid_node_id(id)) {
+      /* Skip this id */
+      continue;
+    }
+    if (true == validate_node_in_edges(id)) {
+      continue;
+    }
+    /* Reach here, it means there is something wrong! 
+     * Print a warning  
+     */
+    all_valid = false;
+  }
+  return all_valid;
+}
+
+/* check if all the nodes' output edges are valid */
+bool LbRRGraph::validate_nodes_out_edges() const {
+  bool all_valid = true;
+  for (const LbRRNodeId& id : nodes()) {
+    /* Try to find if this is an invalid id or not */
+    if (!valid_node_id(id)) {
+      /* Skip this id */
+      continue;
+    }
+    if (true == validate_node_out_edges(id)) {
+      continue;
+    }
+    /* Reach here, it means there is something wrong! 
+     * Print a warning  
+     */
+    all_valid = false;
+  }
+  return all_valid;
+}
+
+/* check all the edges of every node */
+bool LbRRGraph::validate_nodes_edges() const {
+  bool all_valid = true;
+
+  if (false == validate_nodes_in_edges()) {
+    all_valid = false;
+  }
+  if (false == validate_nodes_out_edges()) {
+    all_valid = false;
+  }
+
+  return all_valid;
+}
+
 } /* end namespace openfpga */
diff --git a/openfpga/src/repack/lb_rr_graph.h b/openfpga/src/repack/lb_rr_graph.h
index 4500a504b..3aca85934 100644
--- a/openfpga/src/repack/lb_rr_graph.h
+++ b/openfpga/src/repack/lb_rr_graph.h
@@ -266,13 +266,27 @@ class LbRRGraph {
     LbRREdgeId create_edge(const LbRRNodeId& source, const LbRRNodeId& sink, t_mode* mode);
     void set_edge_intrinsic_cost(const LbRREdgeId& edge, const float& cost);
 
-  public: /* Validators */
+  public: /* Public validators */
     /* Validate is the node id does exist in the RRGraph */
     bool valid_node_id(const LbRRNodeId& node) const;
 
     /* Validate is the edge id does exist in the RRGraph */
     bool valid_edge_id(const LbRREdgeId& edge) const;
 
+    bool validate() const;
+
+  private: /* Private Validators */
+    bool validate_node_sizes() const;
+    bool validate_edge_sizes() const;
+    bool validate_sizes() const;
+    bool validate_node_is_edge_src(const LbRRNodeId& node, const LbRREdgeId& edge) const;
+    bool validate_node_is_edge_sink(const LbRRNodeId& node, const LbRREdgeId& edge) const;
+    bool validate_node_in_edges(const LbRRNodeId& node) const;
+    bool validate_node_out_edges(const LbRRNodeId& node) const;
+    bool validate_nodes_in_edges() const;
+    bool validate_nodes_out_edges() const;
+    bool validate_nodes_edges() const;
+
   private: /* Internal Data */
     /* Node related data */
     vtr::vector<LbRRNodeId, LbRRNodeId> node_ids_;