diff --git a/pkg/api/transactions.go b/pkg/api/transactions.go
index 282bac3b..dd3968ae 100644
--- a/pkg/api/transactions.go
+++ b/pkg/api/transactions.go
@@ -161,6 +161,13 @@ func (a *TransactionsApi) TransactionCreateHandler(c *core.Context) (interface{}
 		return nil, errs.NewIncompleteOrIncorrectSubmissionError(err)
 	}
 
+	tagIds, err := utils.StringArrayToInt64Array(transactionCreateReq.TagIds)
+
+	if err != nil {
+		log.WarnfWithRequestId(c, "[transactions.TransactionCreateHandler] parse tag ids failed, because %s", err.Error())
+		return nil, errs.ErrTransactionTagIdInvalid
+	}
+
 	if transactionCreateReq.Type < models.TRANSACTION_TYPE_MODIFY_BALANCE || transactionCreateReq.Type > models.TRANSACTION_TYPE_TRANSFER {
 		log.WarnfWithRequestId(c, "[transactions.TransactionCreateHandler] transaction type is invalid")
 		return nil, errs.ErrTransactionTypeInvalid
@@ -187,7 +194,7 @@ func (a *TransactionsApi) TransactionCreateHandler(c *core.Context) (interface{}
 	uid := c.GetCurrentUid()
 	transaction := a.createNewTransactionModel(uid, &transactionCreateReq)
 
-	err = a.transactions.CreateTransaction(transaction, transactionCreateReq.TagIds)
+	err = a.transactions.CreateTransaction(transaction, tagIds)
 
 	if err != nil {
 		log.ErrorfWithRequestId(c, "[transactions.TransactionCreateHandler] failed to create transaction \"id:%d\" for user \"uid:%d\", because %s", transaction.TransactionId, uid, err.Error())
@@ -211,6 +218,13 @@ func (a *TransactionsApi) TransactionModifyHandler(c *core.Context) (interface{}
 		return nil, errs.NewIncompleteOrIncorrectSubmissionError(err)
 	}
 
+	tagIds, err := utils.StringArrayToInt64Array(transactionModifyReq.TagIds)
+
+	if err != nil {
+		log.WarnfWithRequestId(c, "[transactions.TransactionModifyHandler] parse tag ids failed, because %s", err.Error())
+		return nil, errs.ErrTransactionTagIdInvalid
+	}
+
 	uid := c.GetCurrentUid()
 	transaction, err := a.transactions.GetTransactionByTransactionId(uid, transactionModifyReq.Id)
 
@@ -227,8 +241,8 @@ func (a *TransactionsApi) TransactionModifyHandler(c *core.Context) (interface{}
 	}
 
 	transactionTagIds := allTransactionTagIds[transaction.TransactionId]
-	addTransactionTagIds := utils.Int64SliceMinus(transactionModifyReq.TagIds, transactionTagIds)
-	removeTransactionTagIds := utils.Int64SliceMinus(transactionTagIds, transactionModifyReq.TagIds)
+	addTransactionTagIds := utils.Int64SliceMinus(tagIds, transactionTagIds)
+	removeTransactionTagIds := utils.Int64SliceMinus(transactionTagIds, tagIds)
 
 	newTransaction := &models.Transaction{
 		TransactionId:        transaction.TransactionId,
diff --git a/pkg/models/transaction.go b/pkg/models/transaction.go
index 93534ae6..039df7f8 100644
--- a/pkg/models/transaction.go
+++ b/pkg/models/transaction.go
@@ -40,21 +40,21 @@ type TransactionCreateRequest struct {
 	DestinationAccountId int64           `json:"destinationAccountId,string" binding:"required,min=1"`
 	SourceAmount         int64           `json:"sourceAmount" binding:"min=-99999999999,max=99999999999"`
 	DestinationAmount    int64           `json:"destinationAmount" binding:"min=-99999999999,max=99999999999"`
-	TagIds               []int64         `json:"tagIds,string"`
+	TagIds               []string        `json:"tagIds"`
 	Comment              string          `json:"comment" binding:"max=255"`
 }
 
 // TransactionModifyRequest represents all parameters of transaction modification request
 type TransactionModifyRequest struct {
-	Id                   int64   `json:"id,string" binding:"required,min=1"`
-	CategoryId           int64   `json:"categoryId,string"`
-	Time                 int64   `json:"time" binding:"required,min=1"`
-	SourceAccountId      int64   `json:"sourceAccountId,string" binding:"required,min=1"`
-	DestinationAccountId int64   `json:"destinationAccountId,string" binding:"required,min=1"`
-	SourceAmount         int64   `json:"sourceAmount" binding:"min=-99999999999,max=99999999999"`
-	DestinationAmount    int64   `json:"destinationAmount" binding:"min=-99999999999,max=99999999999"`
-	TagIds               []int64 `json:"tagIds,string"`
-	Comment              string  `json:"comment" binding:"max=255"`
+	Id                   int64    `json:"id,string" binding:"required,min=1"`
+	CategoryId           int64    `json:"categoryId,string"`
+	Time                 int64    `json:"time" binding:"required,min=1"`
+	SourceAccountId      int64    `json:"sourceAccountId,string" binding:"required,min=1"`
+	DestinationAccountId int64    `json:"destinationAccountId,string" binding:"required,min=1"`
+	SourceAmount         int64    `json:"sourceAmount" binding:"min=-99999999999,max=99999999999"`
+	DestinationAmount    int64    `json:"destinationAmount" binding:"min=-99999999999,max=99999999999"`
+	TagIds               []string `json:"tagIds"`
+	Comment              string   `json:"comment" binding:"max=255"`
 }
 
 // TransactionListByMaxTimeRequest represents all parameters of transaction listing by max time request
@@ -92,7 +92,7 @@ type TransactionInfoResponse struct {
 	DestinationAccountId int64           `json:"destinationAccountId,string"`
 	SourceAmount         int64           `json:"sourceAmount"`
 	DestinationAmount    int64           `json:"destinationAmount"`
-	TagIds               []int64         `json:"tagIds,string"`
+	TagIds               []string        `json:"tagIds"`
 	Comment              string          `json:"comment"`
 }
 
@@ -114,7 +114,7 @@ func (c *Transaction) ToTransactionInfoResponse(tagIds []int64) *TransactionInfo
 		DestinationAccountId: c.DestinationAccountId,
 		SourceAmount:         c.SourceAmount,
 		DestinationAmount:    c.DestinationAmount,
-		TagIds:               tagIds,
+		TagIds:               utils.Int64ArrayToStringArray(tagIds),
 		Comment:              c.Comment,
 	}
 }
diff --git a/pkg/utils/converter.go b/pkg/utils/converter.go
index f5a5f4a8..5eb8512a 100644
--- a/pkg/utils/converter.go
+++ b/pkg/utils/converter.go
@@ -29,11 +29,39 @@ func Int64ToString(num int64) string {
 	return strconv.FormatInt(num, 10)
 }
 
+// Int64ArrayToStringArray returns a array of textual representation of these numbers
+func Int64ArrayToStringArray(num []int64) []string {
+	ret := make([]string, 0, len(num))
+
+	for i := 0; i < len(num); i++ {
+		ret = append(ret, Int64ToString(num[i]))
+	}
+
+	return ret
+}
+
 // StringToInt64 parses a textual representation of the number to int64
 func StringToInt64(str string) (int64, error) {
 	return strconv.ParseInt(str, 10, 64)
 }
 
+// StringArrayToInt64Array parses a series textual representations of the numbers to int64 array
+func StringArrayToInt64Array(strs []string) ([]int64, error) {
+	ret := make([]int64, 0, len(strs))
+
+	for i := 0; i < len(strs); i++ {
+		val, err := StringToInt64(strs[i])
+
+		if err != nil {
+			return nil, err
+		}
+
+		ret = append(ret, val)
+	}
+
+	return ret, nil
+}
+
 // StringTryToInt64 parses a textual representation of the number to int64 if str is valid,
 // or returns the default value
 func StringTryToInt64(str string, defaultValue int64) int64 {