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A new method based on the principle of magnetic circuits is proposed and realized for continuous Ic examination of HTS tapes. The greatest advantages of the new method are that it first eliminates all the noise caused by mechanical fluctuations, and thus makes high speed and high stability measurement possible, and second has a natural ability to measure HTS tape with a magnetic substrate. The principle of the method is introduced with the help of Finite Element Analysis. An apparatus for examination of kilometer long tapes has been constructed, by which continuous Ic examination for a YBa2Cu3O7-x tape with and without a magnetic substrate and a Bi2Si2Ca2Cu3Ox multi-filamentary tape is reported.