A method for evaluation of the linearity of both the ratio error and phase angle error in the current transformer(CT) comparison measurement equipment has been developed by employing the standard resistors with negligible AC-DC resistance difference less than $10^{-5}$. The non-reactive standard resistors for the linearity check of the system are used as the external burden connected with the secondary of CT under test. These burdens consist of nine standard resistors, with the nominal resistance of $0.01{Omega},;0.1{Omega},;0.2{Omega},;0.4{Omega},;0.6{Omega},;1{Omega},;2{Omega},;4{Omega}$, and $10{Omega}$. For linearity check, the developed method has been applied in the CT comparison measurement equipment belonging to the industry.