This paper reviews the research progresses of dual polarization weather radar in China with emphasis on radar data quality control and the measurement accuracy of radar polarization parameters in recent 30 years. It is elaborated that the radar data quality and the accuracy of radar polarization parameter measurements are mainly improved by means of system improvement, system error reduction, and radar ground clutter suppression. The double channel consistency and polarization isolation is the most important performance indicators of dual polarization weather radar. The new progresses of dual polarization weather radar system and its applications are also discussed.