Abstract: Based on the conventional observation data and NCEP reanalysis data, this article analyzes the reasons of a persistent gale happened in the northern Henan Province on 31 March and 1 April 2015. Results show that the cold high pressure was persisting in the cold air flow from high latitudes, while warm low pressure was developing quickly the southwest air flow from low latitudes, it keeps a strong pressure gradient in the northern Henan for a long time, and benefits of the development and persistence of a gale. The persistence of thermal force is conducive to the persistence of the pressure gradient and then to the persistence of high winds. The secondary circulation generated by the distribution of divergence is also conducive to the formation and persistence of the gale.