Abstract: The contrast specimens of titanium alloy pipe are designed and manufactured, and they are tested by three methods: through eddy current, array eddy current and rotating eddy current. The detection results are compared from the aspects of detection sensitivity, circumferential resolution, axial resolution, detection ability of detection blind area and expansion area. The results show that the comprehensive testing ability of array eddy current is better than that of through eddy current and rotating eddy current, and the former one has a broad application prospect in the eddy current testing of titanium alloy heat exchange tubes.