Dealing with the problem that Meteorological Data Operation System (MDOS) version 2.1 doesn’t eliminate the quality statistics of unattended meteorological station and distinguish between regional automatic weather station with quality evaluation and regional automatic weather station without quality evaluation, this paper proposed the ground observation data quality statistical system for Guizhou Province. The system can facilitate staff to complete weekly quality evaluation report, monthly quality evaluation report and quarterly quality evaluation report and so on. Since April 10, 2017, the system has put into business operation, which minimizes the workload of staff and has increased productivity and accuracy.