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From the extreme position of disk motion, we infer the neutron star (NS)surface magnetic field strength B_0 of Z-source GX 17+2 and Cyg X-2. Theinferred B_0 of GX 17+2 and Cyg X-2 are ~(1-5)X10^8 G and ~(1--3)X10^8 G},respectively, which are not inferior to that of millisecond X-ray pulsars oratoll sources. It is likely that the NS magnetic axis of Z sources is parallelto the axis of rotation, which could result in the lack of pulsations in thesesources.

Determining the neutron star surface magnetic field strength of two Z sources