Abstract: To investigate the control potential of Pheropsophus jessoensis against Helicoverpa armigera, the predatory functional response, search efficiency and interference response of adult P. jessoensis to high-instar (4th-6th) H. armigera larvae were analyzed under indoor conditions. The results showed that: 1) The predatory functional response of adult P. jessoensis to 4th-6th instar larvae of H. armigera was consistent with the Holling Ⅱ model, the instantaneous attack rates of adult P. jessoensis were 1.065, 0.808, and 0.816, and the handling time was 0.032, 0.076, and 0.324 d, respectively. In addition, the maximum daily predation amounts of adult P. jessoensis on 4th-6th instar larvae of H. armigera at different densities were 15.6, 6.2, and 2.2, respectively. 2) With increasing H. armigera density, the search efficiency of adult P. jessoensis to 4th-6th instar larvae of H. armigera decreased with the maximum of 0.796 5.3) Adult P. jessoensis exhibited an intraspecific interference effect when preying on 4th-6th instar larvae of H. armigera, the daily predation amounts and predation rates were influenced by their own density.