After a brief introduction about the sampled values based line differential protection， two important effects of the sample values based differential protection（SVBDP） on the line differential protection are analyzed with practical example， i.e. solving the problem of current transformer saturation in the traditional substations and improving the capability of resisting abnormal data in the digital substations. The application of SVBDP can solve both above mentioned problems simultaneously， thus the line differential protection for traditional substations as for digital substations can achieve organic unification.