Based on the monitoring information and sounding data of Lband radar in Yunnan Province, the LBand Radar operating status monitoring platform was developed, which includes the FTP job system, data entry system, and monitoring system. The platform structure and the technical methods are described in detail. Through analyzing the data quality of Lband sounding system, the data quality control method is proposed. The operational application of about one year shows that the platform implemented effectively the monitoring of the upper air sounding equipment and data quality, ensured the stable operation of the upper air sounding network, and improved the data quality in recent years. But the method and thresholds used in data quality control need to be improved in the process of data accumulation.