Since July, China is entering the flood season, from 16:00 to 17:00 on July 20 in Zhengzhou, the rainfall reached 201.9 mm, equivalent to 1/3 of last year's amount falling under 1 hour, the water levels in the city continued to rise and appeared. The heavy rainfall in the whole province reached its peak, power supply was interrupted in some areas, and subways were suspended. The flood protection and disaster control was in severe condition.