Coriolis effect is an important error source in the weak equivalence principle (WEP) test using atom interferometer.In this paper,the problem of Coriolis error in WEP test is studied theoretically and experimentally.In theoretical simulation,the Coriolis effect is analyzed by establishing an error model.The measurement errors of E(o)tv(o)s coefficient (η) in WEP test related to experimental parameters,such as horizontal-velocity difference and horizontal-position difference of atomic clouds,horizontal-position difference of detectors,and rotation compensation of Raman laser’s mirror are calculated.In experimental investigation,the position difference between 85Rb and 87Rb atomic clouds is reduced to 0.1 mm by optimizing the experimental parameters,an altating detection method is used to suppress the error caused by detection position difference,thus the Coriolis error related to the atomic clouds and detectors is reduced to 1.1 × 10-9.This Coriolis error is further corrected by compensating the rotation of Raman laser’s mirror,and the total uncertainty of ηmeasurement related to the Coriolis effect is reduced asδη=4.4 × 10-11.