diff --git a/src/CFGraph/IR_domTree.cpp b/src/CFGraph/IR_domTree.cpp
new file mode 100644
index 0000000..cfab670
--- /dev/null
+++ b/src/CFGraph/IR_domTree.cpp
@@ -0,0 +1,100 @@
+#include "dvm.h"
+#include "IR_domTree.h"
+
+namespace SAPFOR {
+    void DominatorFinder::DFS(BasicBlock* v, int parent_num) {
+        dfs_num[v] = n;
+        vertex[n] = n;
+        semi[n] = n;
+        label[n] = n;
+        ancestor[n] = -1;
+        parent[n] = parent_num;
+        vertices[n++] = v;
+
+        for (const auto& w : v->getNext()) {
+            if (dfs_num[w] == -1)
+                DFS(w, dfs_num[v]);
+        }
+    }
+
+    void DominatorFinder::Compress(int v) {
+        if (ancestor[ancestor[v]] != -1) {
+            Compress(ancestor[v]);
+
+            if (semi[label[ancestor[v]]] < semi[label[v]])
+                label[v] = label[ancestor[v]];
+            ancestor[v] = ancestor[ancestor[v]];
+        }
+    }
+
+    int DominatorFinder::Eval(int v) {
+        if (ancestor[v] == -1) 
+            return v;
+
+        Compress(v);
+        return label[v];
+    }
+
+    void DominatorFinder::Link(int v, int w) {
+        ancestor[w] = v;
+    }
+
+    DominatorFinder::DominatorFinder(std::vector<BasicBlock*>& blocks) {
+        if (blocks.empty()) 
+            return;
+
+        entry = blocks[0];
+        n = 0;
+
+        for (auto block : blocks) 
+            dfs_num[block] = -1;
+
+        int max_size = blocks.size();
+        vertices.resize(max_size);
+        parent.assign(max_size, -1);
+        semi.assign(max_size, -1);
+        vertex.assign(max_size, -1);
+        ancestor.assign(max_size, -1);
+        label.assign(max_size, -1);
+        bucket.resize(max_size);
+
+        DFS(entry, -1);
+
+        for (int i = n - 1; i > 0; --i) {
+            int w = vertex[i];
+
+            for (BasicBlock* v : vertices[w]->getPrev()) {
+                int u = Eval(dfs_num[v]);
+
+                if (semi[u] < semi[w])
+                    semi[w] = semi[u];
+            }
+
+            bucket[vertex[semi[w]]].push_back(w);
+            Link(parent[w], w);
+
+            for (int v : bucket[parent[w]])
+            {
+                int u = Eval(v);
+                if (semi[u] < semi[v])
+                    vertices[v]->setDom(vertices[u]);
+                else
+                    vertices[v]->setDom(vertices[parent[w]]);
+            }
+            bucket[parent[w]].clear();
+        }
+
+        for (int i = 1; i < n; ++i) {
+            int w = vertex[i];
+
+            if (vertices[w]->getDom() != vertices[vertex[semi[w]]])
+                vertices[w]->setDom(vertices[w]->getDom()->getDom());
+        }
+
+        entry->setDom(nullptr);
+    }
+
+    void buildDominatorTree(std::vector<BasicBlock*>& blocks) {
+        DominatorFinder finder(blocks);
+    }
+}
\ No newline at end of file