Abstract: Chang 6 reservoir in Yanchang formation of Huangling oil area has poor physical properties, which belongs to low porosity, low pressure, ultra-low permeability and low production lithologic reservoir. The reservoir has strong heterogeneity and developed fractures, and the conventional stimulation technology has poor effect. In order to improve the stimulation effect, find out the stimulation measures suitable for the reservoir in this block, analyze the reasons for the poor stimulation effect, combined with various stimulation technology mechanisms and field tests, it is concluded that more natural fractures should be connected on the basis of the main fractures in Chang6 reservoir reconstruction of Huangling oil area. In the field test, two better transformation technologies, temporary plugging fracturing and composite particle size, are provided, which can provide a reference for exploration and development in Huangling oil area.