TA7 ELI (extra low interstitial) high pressure pump shell was prepared by powder metallurgy nearnet shaping technology under the hot isostatic pressing parameters of 930 ℃/120 MPa/3 h. The effects of different batches of powder on the properties of TA7 ELI alloy were compared (surface morphology of the powder was cellular in shape, and their D₅₀ values are 67 μm and 74 μm), and the powder shrinkage law of high pressure pump was studied using finite element method. The cutting of the formed high pressure pump shell was performed for dimensional analysis and microstructure observation. The results show that the mechanical properties of TA7 ELI alloy prepared by powder metallurgy is comparable to the properties of wrought alloy. The particle size deviation of two batches of powder shows no significant influence on tensile properties, the microstructure of high pressure pump shell is homogeneous, the hardness value of the characteristic section fluctuates little, and the maximum deviation between the measured results and the predicted results of the key dimensions of the flow channel inside the shell is 5.37%.