In view of the lack of characterization methods for the crosslinked network structure content of viscoelastic particle oil displacement agent products (PPG and B-PPG) at present, the test on the crushing conditions of gel particles in viscoelastic particle oil displacement agent solution confirmed that the crushing extraction process of gel particles was divided into two stages: crushing and trimming, and the best crushing conditions were selected; By conducting interference removal tests on linear structures in viscoelastic particle oil displacement agent solutions, aluminum nitrate was selected as the complexing agent. It was confirmed that with the increase of aluminum nitrate dosage, a three-stage complexation process occurred, and the optimal complexation conditions for completely removing linear structure interference were obtained. Based on the above research, the final testing process for network structure content in viscoelastic particle oil displacement agent samples was obtained. Using the established testing process, the content of cross-linked network structure in actual viscoelastic particle oil displacement agent samples was tested. The results showed that the cross-linked network structure content of B-PPG was about 86%, and that of PPG was about 25%. B-PPG had more cross-linked network structures than PPG.