diff --git a/go/0705-design-hashset.go b/go/0705-design-hashset.go
new file mode 100644
index 000000000..4171b61d9
--- /dev/null
+++ b/go/0705-design-hashset.go
@@ -0,0 +1,28 @@
+type MyHashSet struct {
+    present []bool
+}
+
+func Constructor() MyHashSet {
+    return MyHashSet{
+        present: make([]bool, 1000001),  
+    }
+}
+
+func (this *MyHashSet) Add(key int) {
+    if key >= 0 && key < len(this.present) {
+        this.present[key] = true
+    }
+}
+
+func (this *MyHashSet) Remove(key int) {
+    if key >= 0 && key < len(this.present) {
+        this.present[key] = false
+    }
+}
+
+func (this *MyHashSet) Contains(key int) bool {
+    if key < 0 || key >= len(this.present) {
+        return false
+    }
+    return this.present[key]
+}