Abstract: The methods of control and computation on hysterisis error of drive chains of rotating pedestal for testing antennas are introduced,and it is pointed out in this pape that chemical nickel plating may be used for gears to control tooth thickness so that hysterisis error produced by base tangent average length deviation and centre-to-centre distance deviation is eliminated.The computed results indicate that when using chemical nickel plating to make centre-to-centre distance of gear set adjustable for gears whose precision class is 7,peak value of hysterisis error of drive chains does not exceed 2.37′,and root-mean-square value does not exceed 1.53′.