The code tracking performance assessment method for tradition navigation signal is not applicable for the L1C of new signal system in the presence of continuous wave interference.Therefore, we made a qualitative analysis to the code tracking performance of L1C signal from the perspective of pseudo code by using the odd-even correlation criterion.The assessment methods of “Interference Error Envelope” and “Average Error Envelope” were put forward for making quantitative analysis to the code tracking performance of L1C signal under interference.The result shows that the L1C signal has a better performance than C/A code signal:The code tracking performance of pilot signal is 1~1.3 (with the maximum of 1.4) times better than that of the data signal, while a very few data code signal make a better code tracking than the pilot code signal.