Efficient development of tight oil reservoirs is an important task in the petroleum field. Spontaneous imbibition is an important mechanism for tight oil development，which is receiving increasing attention. Natural cores and artificial cores of the tight sandstone reservoirs in Xinjiang Oilfield were selected. Experiments with improved dynamic imbibition device were carried out to study the influence of permeability，temperature，pressure，core length and fracture density on the dynamic imbibition recovery. In addition，a new dimensionless normalized model of the imbibition recovery was proposed through normalization on the experimental parameters. The new model has a better fitting to the dynamic experimental data than the widely used Ma model. The results show that core permeability has a positive or negative correlation with the dynamic imbibition recovery within a certain permeability level；a higher temperature and a shorter core corresponds to a higher imbibition recovery under the same other conditions；higher fluid pressure is more favorable to the dynamic imbibition at the optimal pressure range of 5-7 MPa in the experimental study；increment of the imbibition recovery is linearly related to the fracture density.