diff --git a/paddle/gserver/layers/SequencePoolLayer.cpp b/paddle/gserver/layers/SequencePoolLayer.cpp
index 35260ca912d5d0e00213ffb7074bd8963da265da..5807c4249620db44fed82a6bb69a77d807d9f0a0 100644
--- a/paddle/gserver/layers/SequencePoolLayer.cpp
+++ b/paddle/gserver/layers/SequencePoolLayer.cpp
@@ -56,17 +56,16 @@ void SequencePoolLayer::forward(PassType passType) {
   CHECK_EQ(newBatchSize_, starts->getSize() - 1);
 
   resetOutput(newBatchSize_, dim);
-  if (type_) {
-    CHECK(input.subSequenceStartPositions)
-        << "when trans_type = seq, input must hasSubseq";
-  }
+
   /* If type_ = kNonSeq, both seq has or not has sub-seq degrade to a non-seq,
    * thus, in this case, output_ has no sequenceStartPositions.
    * If type_ = kSeq, seq has sub-seq degrades to a seq, thus, only in this
    * case, we should compute the new sequenceStartPositions.
   */
   if (type_) {
-    output_.degradeSequence(input, useGpu_);
+    CHECK(input.subSequenceStartPositions)
+        << "when trans_type = seq, input must hasSubseq";
+    output_.degradeSequence(input);
   }
 }
 
diff --git a/paddle/parameter/Argument.cpp b/paddle/parameter/Argument.cpp
index 7a343cca33f5b420be6192231ac73ca1c2da5fb9..2f025f729087286274b35cd3b0396a4bd13115d1 100644
--- a/paddle/parameter/Argument.cpp
+++ b/paddle/parameter/Argument.cpp
@@ -583,7 +583,7 @@ void Argument::checkSubset() const {
   }
 }
 
-void Argument::degradeSequence(const Argument& input, bool useGpu) {
+void Argument::degradeSequence(const Argument& input) {
   CHECK_EQ(input.hasSubseq(), 1UL);
   size_t numSequences = input.getNumSequences();
   size_t numSubSequences = input.getNumSubSequences();
diff --git a/paddle/parameter/Argument.h b/paddle/parameter/Argument.h
index 9ef44be0cb3b960db1e789f3f26bb66d1fe63c81..129b7c4f8bdcf566845887ad2b4638ea944f915a 100644
--- a/paddle/parameter/Argument.h
+++ b/paddle/parameter/Argument.h
@@ -296,7 +296,7 @@ struct Argument {
   /*
    sequence has sub-sequence degrades to a sequence.
    */
-  void degradeSequence(const Argument& input, bool useGpu);
+  void degradeSequence(const Argument& input);
 
   /**
    * @brief getValueString will return the argument's output in string. There