Based on datasets of ADTD lightning′s location and graphic system and 714CD Doppler radar echo, characteristics and relationship of cloudtoground lightning and radar echo between the thunderstorm with hail and the strong rainstorm, which happened eight times from 2004 to 2006, are analyzed. The results show that, the radar echo intensity of thunderstorm with hail is between 50 to 60 dBz, while that of rainstorm is between 40 to 55 dBz. The lightning frequency of rainstorm is obviously more than that of thunderstorm with hail. The latter is major to positive lightning, whose ratio is more than 50%, while the former is less than 6%, and the strong lightning may occur during the whole thunderstorm process. Lightning occurs before or at the appearance of blocky single echo. A spot of lightnings can be found at 20-30 km in front of strong echo′s moving direction, which can foretell the direction of strong echo′s moving well. For the rainstorm, lightning can′t forecast the beginning of rainfall well. The increase of lightning frequency means the lasting period of rainstorm, and weaker lightning appears earlier than its echo. When thunderstorm with hail and the lasting period of rainstorm occur, the areas of positive and negative lightning are corresponding to the strong echo of 40 dBz well. When thunderstorm is lasting, lightning frequency increases suddenly. Its change displays a single peak, while two or more peaks and high frequency appear during rainstorm. The onehour lightning frequency of rainstorm is much more than that of the former. The heights of 0 ℃ , -10 ℃ and -20 ℃ and the height of cloud are higher than those of thunderstorm with hail, and the height differences between ΔH-10～0 ℃, ΔH-20～0 ℃ and ΔHct～0℃ are also larger than those of thunderstorm with hail.