i got it
data = {
"reportUnitUri": "/reports/samples/naokiDemo",
"async": "false",
"freshData": "false",
"saveDataSnapshot": "false",
"outputFormat": "pdf",
"interactive": "false",
"parameters":{
"reportParameter":[
{"name":"queryConditions","value":[QCondition]},
{"name":"headPara","value":[repHead]}
]
}
}