diff --git a/.github/workflows/scala.yml b/.github/workflows/scala.yml
index 6594dc8ae..a691b7444 100644
--- a/.github/workflows/scala.yml
+++ b/.github/workflows/scala.yml
@@ -71,3 +71,4 @@ jobs:
         sbt 'testOnly gensym.TestImpCPSGS_Z3'
         sbt 'testOnly gensym.TestLibrary'
         sbt 'testOnly gensym.wasm.TestEval'
+        sbt 'testOnly gensym.wasm.TestScriptRun'
diff --git a/benchmarks/wasm/script/script_basic.wast b/benchmarks/wasm/script/script_basic.wast
new file mode 100644
index 000000000..4d1d1cb55
--- /dev/null
+++ b/benchmarks/wasm/script/script_basic.wast
@@ -0,0 +1,8 @@
+(module
+ (func $one (result i32)
+       i32.const 1)
+ (export "one" (func 0))
+)
+
+(assert_return (invoke "one") (i32.const 1))
+
diff --git a/src/main/scala/wasm/AST.scala b/src/main/scala/wasm/AST.scala
index bb4d606c2..fb4c3fdbf 100644
--- a/src/main/scala/wasm/AST.scala
+++ b/src/main/scala/wasm/AST.scala
@@ -292,3 +292,17 @@ case class ExportFunc(i: Int) extends ExportDesc
 case class ExportTable(i: Int) extends ExportDesc
 case class ExportMemory(i: Int) extends ExportDesc
 case class ExportGlobal(i: Int) extends ExportDesc
+
+case class Script(cmds: List[Cmd]) extends WIR
+abstract class Cmd extends WIR
+// TODO: can we turn abstract class sealed?
+case class CmdModule(module: Module) extends Cmd
+
+abstract class Action extends WIR
+case class Invoke(instName: Option[String], name: String, args: List[Value]) extends Action
+
+abstract class Assertion extends Cmd
+case class AssertReturn(action: Action, expect: List[Num] /* TODO: support multiple expect result type*/)
+    extends Assertion
+case class AssertTrap(action: Action, message: String) extends Assertion
+
diff --git a/src/main/scala/wasm/MiniWasm.scala b/src/main/scala/wasm/MiniWasm.scala
index 642936242..ba2b7a85b 100644
--- a/src/main/scala/wasm/MiniWasm.scala
+++ b/src/main/scala/wasm/MiniWasm.scala
@@ -18,6 +18,44 @@ case class ModuleInstance(
     exports: List[Export] = List()
 )
 
+object ModuleInstance {
+  def apply(module: Module): ModuleInstance = {
+    val types = List()
+    val funcs = module.definitions
+      .collect({
+        case FuncDef(_, fndef @ FuncBodyDef(_, _, _, _)) => fndef
+      })
+      .toList
+
+    val globals = module.definitions
+      .collect({
+        case Global(_, GlobalValue(ty, e)) =>
+          (e.head) match {
+            case Const(c) => RTGlobal(ty, c)
+            // Q: What is the default behavior if case in non-exhaustive
+            case _ => ???
+          }
+      })
+      .toList
+
+    // TODO: correct the behavior for memory
+    val memory = module.definitions
+      .collect({
+        case Memory(id, MemoryType(min, max_opt)) =>
+          RTMemory(min, max_opt)
+      })
+      .toList
+
+    val exports = module.definitions
+      .collect({
+        case e @ Export(_, ExportFunc(_)) => e
+      })
+      .toList
+
+    ModuleInstance(types, module.funcEnv, memory, globals, exports)
+  }
+}
+
 object Primtives {
   def evalBinOp(op: BinOp, lhs: Value, rhs: Value): Value = op match {
     case Add(_) =>
@@ -412,33 +450,7 @@ object Evaluator {
 
     if (instrs.isEmpty) println("Warning: nothing is executed")
 
-    val types = List()
-    val funcs = module.definitions
-      .collect({
-        case FuncDef(_, fndef @ FuncBodyDef(_, _, _, _)) => fndef
-      })
-      .toList
-
-    val globals = module.definitions
-      .collect({
-        case Global(_, GlobalValue(ty, e)) =>
-          (e.head) match {
-            case Const(c) => RTGlobal(ty, c)
-            // Q: What is the default behavior if case in non-exhaustive
-            case _ => ???
-          }
-      })
-      .toList
-
-    // TODO: correct the behavior for memory
-    val memory = module.definitions
-      .collect({
-        case Memory(id, MemoryType(min, max_opt)) =>
-          RTMemory(min, max_opt)
-      })
-      .toList
-
-    val moduleInst = ModuleInstance(types, module.funcEnv, memory, globals)
+    val moduleInst = ModuleInstance(module)
 
     Evaluator.eval(instrs, List(), Frame(moduleInst, ArrayBuffer(I32V(0))), halt, List(halt))
   }
diff --git a/src/main/scala/wasm/MiniWasmScript.scala b/src/main/scala/wasm/MiniWasmScript.scala
new file mode 100644
index 000000000..26103f080
--- /dev/null
+++ b/src/main/scala/wasm/MiniWasmScript.scala
@@ -0,0 +1,49 @@
+package gensym.wasm.miniwasmscript
+
+import gensym.wasm.miniwasm._
+import gensym.wasm.ast._
+import scala.collection.mutable.{ListBuffer, Map, ArrayBuffer}
+
+sealed class ScriptRunner {
+  val instances: ListBuffer[ModuleInstance] = ListBuffer()
+  val instanceMap: Map[String, ModuleInstance] = Map()
+
+  def getInstance(instName: Option[String]): ModuleInstance = {
+    instName match {
+	  case Some(name) => instanceMap(name)
+      case None => instances.head
+    }
+  }
+
+  def assertReturn(action: Action, expect: List[Value]): Unit = {
+    action match {
+      case Invoke(instName, name, args) =>
+        val module = getInstance(instName)
+        val func = module.exports.collectFirst({
+          case Export(`name`, ExportFunc(index)) =>
+            module.funcs(index)
+          case _ => throw new RuntimeException("Not Supported")
+        }).get
+        val instrs = func match {
+          case FuncDef(_, FuncBodyDef(ty, _, locals, body)) => body
+        }
+        val k = (retStack: List[Value]) => retStack
+        val actual = Evaluator.eval(instrs, List(), Frame(module, ArrayBuffer(args: _*)), k, List(k))
+        assert(actual == expect)
+    }
+  }
+
+  def runCmd(cmd: Cmd): Unit = {
+    cmd match {
+      case CmdModule(module) => instances += ModuleInstance(module)
+      case AssertReturn(action, expect) => assertReturn(action, expect)
+      case AssertTrap(action, message) => ???
+    }
+  }
+
+  def run(script: Script): Unit = {
+    for (cmd <- script.cmds) {
+      runCmd(cmd)
+    }
+  }
+}
diff --git a/src/main/scala/wasm/Parser.scala b/src/main/scala/wasm/Parser.scala
index a2019de26..079370e72 100644
--- a/src/main/scala/wasm/Parser.scala
+++ b/src/main/scala/wasm/Parser.scala
@@ -633,7 +633,59 @@ class GSWasmVisitor extends WatParserBaseVisitor[WIR] {
     else if (ctx.MEMORY != null)  ExportMemory(id)
     else if (ctx.GLOBAL != null) ExportGlobal(id)
     else error
+  }
+
+  override def visitScriptModule(ctx: ScriptModuleContext): Module = {
+    if (ctx.module_ != null) {
+      visitModule_(ctx.module_).asInstanceOf[Module]
+    } else {
+      throw new RuntimeException("Unsupported")
+    }
+  }
+
+  override def visitAction_(ctx: Action_Context): Action = {
+    if (ctx.INVOKE != null) {
+      val instName = if (ctx.VAR != null) Some(ctx.VAR().getText) else None
+      var name = ctx.name.getText.substring(1).dropRight(1)
+      var args = for (constCtx <- ctx.constList.wconst.asScala) yield {
+        val Array(ty, _) = constCtx.CONST.getText.split("\\.")
+        visitLiteralWithType(constCtx.literal, toNumType(ty))
+      }
+      Invoke(instName, name, args.toList)
+    } else {
+      throw new RuntimeException("Unsupported")
+    }
+  }
+
+  override def visitAssertion(ctx: AssertionContext): Assertion = {
+    if (ctx.ASSERT_RETURN != null) {
+      val action = visitAction_(ctx.action_)
+      val expect = for (constCtx <- ctx.constList.wconst.asScala) yield {
+        val Array(ty, _) = constCtx.CONST.getText.split("\\.")
+        visitLiteralWithType(constCtx.literal, toNumType(ty))
+      }
+      println(s"expect = $expect")
+      AssertReturn(action, expect.toList)
+    } else {
+      throw new RuntimeException("Unsupported")
+    }
+  }
 
+  override def visitCmd(ctx: CmdContext): Cmd = {
+    if (ctx.assertion != null) {
+      visitAssertion(ctx.assertion)
+    } else if (ctx.scriptModule != null) {
+      CmdModule(visitScriptModule(ctx.scriptModule))
+    } else {
+      throw new RuntimeException("Unsupported")
+    }
+  }
+
+  override def visitScript(ctx: ScriptContext): WIR = {
+    val cmds = for (cmd <- ctx.cmd.asScala) yield {
+      visitCmd(cmd)
+    }
+    Script(cmds.toList)
   }
 
   override def visitTag(ctx: TagContext): WIR = {
@@ -645,15 +697,35 @@ class GSWasmVisitor extends WatParserBaseVisitor[WIR] {
 }
 
 object Parser {
-  def parse(input: String): Module = {
+  private def makeWatVisitor(input: String) = {
     val charStream = new ANTLRInputStream(input)
     val lexer = new WatLexer(charStream)
     val tokens = new CommonTokenStream(lexer)
-    val parser = new WatParser(tokens)
+    new WatParser(tokens)
+  }
+
+  def parse(input: String): Module = {
+    val parser = makeWatVisitor(input)
     val visitor = new GSWasmVisitor()
     val res: Module  = visitor.visit(parser.module).asInstanceOf[Module]
     res
   }
 
   def parseFile(filepath: String): Module = parse(scala.io.Source.fromFile(filepath).mkString)
+
+  // parse extended webassembly script language
+  def parseScript(input: String): Option[Script] = {
+    val parser = makeWatVisitor(input)
+    val visitor = new GSWasmVisitor()
+    val tree = parser.script()
+    val errorNumer = parser.getNumberOfSyntaxErrors()
+    if (errorNumer != 0) None
+    else {
+      val res: Script = visitor.visitScript(tree).asInstanceOf[Script]
+      Some(res)
+    }
+  }
+
+  def parseScriptFile(filepath: String): Option[Script] =
+    parseScript(scala.io.Source.fromFile(filepath).mkString)
 }
diff --git a/src/test/scala/genwasym/TestScriptRun.scala b/src/test/scala/genwasym/TestScriptRun.scala
new file mode 100644
index 000000000..2c1e3f9d2
--- /dev/null
+++ b/src/test/scala/genwasym/TestScriptRun.scala
@@ -0,0 +1,19 @@
+package gensym.wasm
+
+import gensym.wasm.parser.Parser
+import gensym.wasm.miniwasmscript.ScriptRunner
+
+import org.scalatest.FunSuite
+
+
+class TestScriptRun extends FunSuite {
+  def testFile(filename: String): Unit = {
+    val script = Parser.parseScriptFile(filename).get
+    val runner = new ScriptRunner()
+    runner.run(script)
+  }
+
+  test("simple script") {
+    testFile("./benchmarks/wasm/script/script_basic.wast")
+  }
+}