In the hydraulic fracturing of low permeability reservoir, the matrix's imbibition effect significantly affects the well productivity after fracturing. First, an experimental device was developed to simulate the near-artificial fracture reservoir environment, and then CT technology was used to detect the saturation dynamics of the near-fracture reservoir to monitor the filtration process of fracturing fluid migration to the reservoir. Based on this, the correlation between capillary force and retention of fracturing fluid migration and displacement ( viscous) force in low permeability sandstone reservoir is explained and quantified, and the difference between capillary force and high permeability core is compared. The study shows that although the capillary force is stronger in low permeability reservoirs, the low permeability and heterogeneity of the formation will inhibit the influence of capillary force on fracturing fluid migration. The degree of saturation variation induced by permeability in low permeability reservoir is similar to that in high permeability reservoir. In addition, the fracturing fluid filtration loss during the shut-in period will cause a delay in gas flowback and affect gas well productivity. The results provide a basis for predicting the retention and migration of water-based fracturing fluid in near-fractured reservoirs and a reference for predicting the productivity of oil wells in low-permeability fractured reservoirs.