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To ensure the validity and reliability of reversible circuits, fault detection is necessarily. Two methods to get complete test set with respect to missing-gate fault (MGF) in reversible circuits were introduced. They are the method that divided the circuit into subcircuit to get the complete test set which is not minimal and the set covering method to get the minimal complete test set. Comparing to DFT detection method, the methods introduced in this paper do not need additional gates; they do not change the structure of the circuits and do not depend on implement technologies. So, it can be widely applied.