Abstract: Based on the data of 7.19 flood and 7.23 flood in Weigan river basin, the characteristics and cause reasons were analyzed. By comparison, similarities and differences were found out which were valuable for reference in understanding of floods in Weigan river basin. As well, the analysis could be basis for further flood prevention.

Key words: Weigan river basin, storm, flood, peak flow

摘要： 根据渭干河流域“7.19”和“7.23”洪水的大量相关资料，探讨了这两场洪水的特点，对成因进行比较分析，找出其异同点，这对认识渭干河流域的洪水特性具有一定的参考价值，而且将为防汛抗洪提供了可靠科学依据。

关键词: 渭干河流域, 暴雨, 洪水, 洪峰流量