According to the deployment of the China Meteorological Administration, since December 1, 2023, the new generation of weather radar in all network operations nationwide has officially operated ROSE2.1. In order to evaluate the effectiveness of ROSE2.1 hail alarm products in short-term monitoring and early warning services in Qiandongnan Prefecture and enhance local hail monitoring and early warning capabilities, this article selects a hail weather process that occurred in Qiandongnan Prefecture on April 18, 2023. Based on the ROSE2.1.2 version software, using the ROSE precipitation estimation and alarm product evaluation system, the hail alarm products (UAM hail) of the two radar ROSE2.1 systems of the Rongjiang dual polarization radar and the Sansui single polarization radar, as well as the hail alarm products (NUAM hail) of the two radar networks, are tested and evaluated from seven aspects: hit times, false alarm times, missed report times, hit rate, false alarm rate, missed report rate, and accuracy rate, from three distance levels , and their alarm advance is calculated.The results are as follows: ①The hit rate and accuracy of the hail warning products UAM hail and NUAM hail from the Rongjiang radar and the two radar networks are directly proportional to the distance, that is, they increase with the increase of distance. The hit rate and accuracy of the hail warning product UAM hail from the San Sui radar are inversely proportional to the distance, that is, they decrease with the increase of distance.②The three products have their own strengths and complement each other"s weaknesses. From the perspective of distance, the San Sui radar performs best within 50km, while the Rongjiang radar performs best above 50km.On average, the Rongjiang radar performs best, and the networking performance is significantly improved compared to the San Sui radar. The San Sui radar has no false alarm rate, while the Rongjiang radar and networking have a certain false alarm rate.③The ROSE2.1 hail warning product has the highest average time advance of the Rongjiang radar, and the lowest for the networked products, but both are above 30 minutes overall, which is a good indicator for short-term and imminent forecasting and warning services for hail.In the short-term and imminent monitoring and warning service for hail, when the ROSE2.1 hail warning product continues to alarm less than 2 times, the warning product can be considered as a false alarm.