In the Neogene formation of eastern Henan province， the traditional and emerging non-granulation well forming process are being applied. In this paper， by comparing the water output of multiple wells with adjacent positions， similar depth， similar well structure and similar water intake layer level in the region， and analyzing the formation factors， drilling diameter， well washing method and well formation process factors， the main reasons affecting the water volume under specific conditions are found out. It provides a reference for selecting a suitable well-forming process in different regions.