To achieve more accurate performance evaluation and functional verification of navigation interference, this essay used two important indicators of carrier phase error and code phase error to measure the interference effect on the receiver for the Costas carrier tracking loop and incoherent lead-delay-delayed-delay-locked-loop commonly used in the GPS tracking process. The above indicators were simulated under different interference scenarios. The simulation results showed that with the increase of the noise to noise ratio or under the same noise to noise ratio, as the interference bandwidth decreases, the carrier phase error and the code phase error deteriorated. That is, the interference effect was positively correlated with the interference power and negatively correlated with the interference bandwidth. The carrier loop tracking error under interference was usually several orders of magnitude smaller than the code tracking error. The simulation results verified the rationality of the assessment method.