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The development of tight oil depends on the characteristics of complicated pore throat parameters. In this study, the tight oil samples obtained from the Yanchang group of Ordos basin (China) are tested using the constant rate mercury intrusion technique to quantitatively determine the size of pore and throat parameters, as well as analyze the key parameters that control the quality of tight oil reservoir. The pore radius of sample analogously distributes in 100-200 lm and average pore radius varies from 103.7 to 139.74 lm. When the permeability is less than 1 9 10 -3 lm 2 , the throat peak radius and the average throat radius will be less than 1 lm; furthermore, the variation of throat distribution is in the range of 0.2-0.5 and 0.2-1.0 lm. On the contrary, if the permeability is greater than 1 9 10 -3 lm 2 , the average throat radius will be greater than 1 lm and the distribution range of throat will spread from 0.2-3.4 to 0.2-8.8 lm. As for the eleven samples, the main flow throat radius lies in the range of 0.41-3.71 lm, the throat quantity changes wildly from 1324 to 4271 number/cm 3 , the average pore throat ratio varies from 503.59 to 86.11, the pore mercury saturation alters in 17.65-55.95 % and the throat mercury saturation distributes in 13.44-27.6 %. It can be learned that there is no obvious difference in pore parameters for tight oil reservoir. Therefore, the difference of pore throat structure mainly existed in throat parameters, and the throat parameters are the key factors that affect the physical properties and recovery results.