diff --git a/mix/CodeModel.cpp b/mix/CodeModel.cpp
index 1ca5d9160..8cb901a39 100644
--- a/mix/CodeModel.cpp
+++ b/mix/CodeModel.cpp
@@ -493,9 +493,18 @@ dev::bytes const& CodeModel::getStdContractCode(const QString& _contractName, co
 	return m_compiledContracts.at(_contractName);
 }
 
+void CodeModel::retrieveSubType(SolidityType& _wrapperType, dev::solidity::Type const* _type)
+{
+	if (_type->getCategory() == Type::Category::Array)
+	{
+		ArrayType const* arrayType = dynamic_cast<ArrayType const*>(_type);
+		_wrapperType.baseType = std::make_shared<dev::mix::SolidityType const>(nodeType(arrayType->getBaseType().get()));
+	}
+}
+
 SolidityType CodeModel::nodeType(dev::solidity::Type const* _type)
 {
-	SolidityType r { SolidityType::Type::UnsignedInteger, 32, 1, false, false, QString::fromStdString(_type->toString()), std::vector<SolidityDeclaration>(), std::vector<QString>() };
+	SolidityType r { SolidityType::Type::UnsignedInteger, 32, 1, false, false, QString::fromStdString(_type->toString()), std::vector<SolidityDeclaration>(), std::vector<QString>(), nullptr };
 	if (!_type)
 		return r;
 	switch (_type->getCategory())
@@ -536,6 +545,7 @@ SolidityType CodeModel::nodeType(dev::solidity::Type const* _type)
 		r.count = static_cast<unsigned>(array->getLength());
 		r.dynamicSize = _type->isDynamicallySized();
 		r.array = true;
+		retrieveSubType(r, _type);
 	}
 		break;
 	case Type::Category::Enum:
diff --git a/mix/CodeModel.h b/mix/CodeModel.h
index b9d06341d..7841c7142 100644
--- a/mix/CodeModel.h
+++ b/mix/CodeModel.h
@@ -224,6 +224,8 @@ public:
 	Q_INVOKABLE void unregisterContractSrc(QString const& _documentId);
 	/// Convert solidity type info to mix type
 	static SolidityType nodeType(dev::solidity::Type const* _type);
+	/// Retrieve subtype
+	static void retrieveSubType(SolidityType& _wrapperType, dev::solidity::Type const* _type);
 	/// Check if given location belongs to contract or function
 	bool isContractOrFunctionLocation(dev::SourceLocation const& _location);
 	/// Get funciton name by location
diff --git a/mix/ContractCallDataEncoder.cpp b/mix/ContractCallDataEncoder.cpp
index 62cc39a04..da21869e4 100644
--- a/mix/ContractCallDataEncoder.cpp
+++ b/mix/ContractCallDataEncoder.cpp
@@ -37,24 +37,6 @@ using namespace dev;
 using namespace dev::solidity;
 using namespace dev::mix;
 
-static QList<int> extractDimension(QString const& _type)
-{
-	QList<int> dim;
-	QRegExp dimExtract("(\\[[^\\]]*\\])");
-	int pos = dimExtract.indexIn(_type);
-	while (pos != -1)
-	{
-		QString d = dimExtract.cap(0);
-		pos += d.length();
-		pos = dimExtract.indexIn(_type, pos);
-		if (d == "[]")
-			dim.push_front(-1);
-		else
-			dim.push_front(d.replace("[", "").replace("]", "").toInt());
-	}
-	return dim;
-}
-
 bytes ContractCallDataEncoder::encodedData()
 {
 	bytes r(m_encodedData);
@@ -81,25 +63,24 @@ void ContractCallDataEncoder::encode(QFunctionDefinition const* _function)
 	m_encodedData.insert(m_encodedData.end(), hash.begin(), hash.end());
 }
 
-void ContractCallDataEncoder::encodeArray(QJsonArray const& _array, QList<int> _dim, SolidityType const& _type, bytes& _content)
+void ContractCallDataEncoder::encodeArray(QJsonArray const& _array, SolidityType const& _type, bytes& _content)
 {
 	size_t offsetStart = _content.size();
-	if (_dim[0] == -1)
+	if (_type.dynamicSize)
 	{
 		bytes count = bytes(32);
 		toBigEndian((u256)_array.size(), count);
 		_content += count; //reserved space for count
 	}
-	_dim.pop_front();
 
 	int k = 0;
 	for (QJsonValue const& c: _array)
 	{
 		if (c.isArray())
 		{
-			if (_dim[0] == -1)
+			if (_type.baseType->dynamicSize)
 				m_dynamicOffsetMap.push_back(std::make_pair(m_dynamicData.size() + offsetStart + 32 + k * 32, m_dynamicData.size() + _content.size()));
-			encodeArray(c.toArray(), _dim, _type, _content);
+			encodeArray(c.toArray(), *_type.baseType, _content);
 		}
 		else
 		{
@@ -128,16 +109,15 @@ void ContractCallDataEncoder::encode(QVariant const& _data, SolidityType const&
 	}
 	else if (_type.array)
 	{
-		QList<int> dim = extractDimension(_type. name);
 		bytes content;
 		size_t size = m_encodedData.size();
-		if (dim.front() == -1)
+		if (_type.dynamicSize)
 		{
 			m_encodedData += bytes(32); // reserve space for offset
 			m_staticOffsetMap.push_back(std::make_pair(size, m_dynamicData.size()));
 		}
 		QJsonDocument jsonDoc = QJsonDocument::fromJson(_data.toString().toUtf8());
-		encodeArray(jsonDoc.array(), dim, _type, content);
+		encodeArray(jsonDoc.array(), _type, content);
 
 		if (!_type.dynamicSize)
 			m_encodedData.insert(m_encodedData.end(), content.begin(), content.end());
diff --git a/mix/ContractCallDataEncoder.h b/mix/ContractCallDataEncoder.h
index e29cb92e0..be11a5772 100644
--- a/mix/ContractCallDataEncoder.h
+++ b/mix/ContractCallDataEncoder.h
@@ -71,7 +71,7 @@ private:
 	QString toString(bool _b);
 	QString toString(dev::bytes const& _b);
 	bool asString(dev::bytes const& _b, QString& _str);
-	void encodeArray(QJsonArray const& _array, QList<int> _dim, SolidityType const& _type, bytes& _content);
+	void encodeArray(QJsonArray const& _array, SolidityType const& _type, bytes& _content);
 	QString toChar(dev::bytes const& _b);
 
 private:
diff --git a/mix/SolidityType.h b/mix/SolidityType.h
index 75f47e7fa..13f5c2ecd 100644
--- a/mix/SolidityType.h
+++ b/mix/SolidityType.h
@@ -57,6 +57,7 @@ struct SolidityType
 	QString name;
 	std::vector<SolidityDeclaration> members; //for struct
 	std::vector<QString> enumNames; //for enum
+	std::shared_ptr<SolidityType const> baseType;
 };
 
 struct SolidityDeclaration