Abstract: In the process of global navigation satellite system (GNSS) signal structural assessment, multipath error envelope gives the upper bound of multipath error,but it can not effectively reflect code tracking multipath error caused by the carrier and subcarrier phase of reflected signal. To solve this problem,a code tracking multipath error non-envelope assessment method is proposed. In the proposed method, the code phase delay is mapped to carrier and subcarrier phase to get an accurate theoretical code tracking multipath error value. This approach also avoids calculation of the envelope curve as found in the multipath error envelope analysis method. The theoretical expression of the proposed method was derived and a multipath rejection performance experiment simulation was performed for BPSK, AltBOC, MBOC and BOC. The multipath error envelope and proposed method were compared. The theoretical and simulated results show that the proposed method can be used to assess code tracking multipath error more accurately, and provides effective theoretical guidance for dealing with GNSS signal multipath error.