The Chang7 tight sandstone reservoir in Ordos basin is usually developed fractures by hydraulic fracturing and then waterflooding, imbibition depending on capillary force is very important for enhancing oil recovery of tight sandstone reservoir for the hydrophilicity of the sandstone. In order to find out the effect of imbibition to enhance oil recovery in Chang 7 tight sandstone, the influence factors of static imbibition and dynamic imbibition of Chang 7 tight sandstone reservoir core in Ordos basin are analyzed in this paper. Subsequently, the influence factors of dynamic imbibition of fractured sandstone core are studied. The results show that the dynamic imbibition recovery is about 2 times of the static imbibition recovery. The static imbibition is mainly affected by capillary force, and there is the best interfacial tension to maximize the oil recovery. While the dynamic imbibition recovery is composed of imbibition and displacement, and the contribution of imbition to the total recovery factor is 15%~40%, the small pore is the main contributor. Enhanced oil recovery by soaking achieved 10%~15% after natural core displacement with fractures. This study can make people further understand the tight reservoir imbibition control mechanism, provide guidance and reference for the implementation of field stimulation measures.