diff --git a/pvDataApp/factory/PVStructureArray.cpp b/pvDataApp/factory/PVStructureArray.cpp
index 9d5720f..18d7c1e 100644
--- a/pvDataApp/factory/PVStructureArray.cpp
+++ b/pvDataApp/factory/PVStructureArray.cpp
@@ -32,9 +32,10 @@ size_t PVStructureArray::append(size_t number)
     size_t newLength = currentLength + number;
     setCapacity(newLength);
     StructureConstPtr structure = structureArray->getStructure();
+    PVStructurePtrArray vec = *value.get();
     for(size_t i=currentLength; i<newLength; i++) {
-        PVStructurePtrArray vec = *value.get();
-        vec[i] = getPVDataCreate()->createPVStructure(structure);
+        PVStructurePtr pvStructure(getPVDataCreate()->createPVStructure(structure));
+        vec[i].swap(pvStructure);
     }
     return newLength;
 }
@@ -151,7 +152,8 @@ size_t PVStructureArray::put(size_t offset,size_t len,
                    "Element is not a compatible structure"));
     	    }
     	}
-    	to[i+offset] = frompv;
+        PVStructurePtr pvStructure(frompv);
+    	to[i+offset].swap(pvStructure);
     }
     postPut();
     setLength(length);
diff --git a/testApp/pv/testPVStructureArray.cpp b/testApp/pv/testPVStructureArray.cpp
index 727c733..503b828 100644
--- a/testApp/pv/testPVStructureArray.cpp
+++ b/testApp/pv/testPVStructureArray.cpp
@@ -29,6 +29,30 @@ static StandardFieldPtr standardField;
 static StandardPVFieldPtr standardPVField;
 static String buffer;
 
+void testPVStructureArray(FILE * fd) {
+    StructureArrayConstPtr alarm(
+        fieldCreate->createStructureArray(standardField->alarm()));
+    PVStructureArrayPtr pvAlarmStructure(
+         pvDataCreate->createPVStructureArray(alarm));
+    PVStructurePtrArray palarms;
+    size_t na=2;
+    palarms.reserve(na);
+    for(size_t i=0; i<na; i++) {
+        palarms.push_back(
+            pvDataCreate->createPVStructure(standardField->alarm()));
+    }
+    PVStructurePtr *xxx = &palarms[0];
+for(size_t i=0;i<na; i++) {
+buffer.clear();
+xxx[i]->toString(&buffer);
+printf("xxx[%d]\n%s\n",(int)i,buffer.c_str());
+}
+    pvAlarmStructure->put(0,2,xxx,0);
+    buffer.clear();
+    pvAlarmStructure->toString(&buffer);
+    fprintf(fd,"pvAlarmStructure\n%s\n",buffer.c_str());
+}
+
 StructureConstPtr getPowerSupplyStructure() {
     String properties("alarm");
     FieldConstPtrArray  fields;
@@ -83,6 +107,7 @@ int main(int argc,char *argv[])
     pvDataCreate = getPVDataCreate();
     standardField = getStandardField();
     standardPVField = getStandardPVField();
+    testPVStructureArray(fd);
     testPowerSupplyArray(fd);
     return(0);
 }