The fluid distribution characteristics of tight sandstone reservoir are complicated，and the movable fluid parameters are important to evaluate the fluid distribution and percolation characteristics. Based on the low-field nuclear magnetic resonance（NMR），high pressure mercury injection capillary pressure（MICP），X-ray diffraction，and scanning electron microscope（SEM）experiments，the movable fluid in 30 core samples collected from Chang7 Member of Wuqi Oilfield in Ordos Basin are analyzed. The reservoirs can be divided into three types：Ⅰ，ⅡandⅢ，and the division standard is established. The amount of movable fluid in the pores with different pore radius of three types of reservoirs is quantitatively evaluated and the influencing factors of the movable fluid are analyzed. The results show that the macropore，pore throat connectivity and the amount of movable fluid decrease in sequence. There are large differences in the occurrence characteristics of movable fluid. The average values of movable fluid saturation in typeⅠ，typeⅡand typeⅢreservoirs are 50.35%，42.00% and 21.40%，respectively. The main direction of exploration and development in the future is typeⅠandⅡreservoirs，which have a large amount of similar movable fluid. The movable fluid of the target reservoir mainly distribute in the pores with the radius of 0.053-0.527 μm in typeⅠandⅡreservoirs. Permeability and median radius are the main factors that affect the characteristics of the movable fluid，in typeⅠandⅡreservoirs，the movable fluid is also affected by porosity，macropore porosity，sorting coefficient，effective porosity and clay minerals. However，there are many and complex influencing factors in typeⅢreservoir，and no obvious influencing factors have been found.