An annular mapping catheter (10), comprising a catheter body (12). The catheter body (12) has a distal end and a proximal end, the distal end of the catheter body (12) is provided with a distal end assembly (13), and the proximal end of the catheter body (12) is provided with a handle (14); the distal end assembly (13) is made of a head end catheter (31) that has a shape memory function, the distal end assembly (13) in a free state presents a predetermined bent shape comprising an annular part (34) and a vertical part (35), and the vertical part (35) connects the annular part (34) to the catheter body (12); and the distal end assembly (13) is provided with an electrode (33). The annular mapping catheter (10) can detect an electrocardiogram activity near a pulmonary vein ostium and can better locate a cryoballoon (21) in the heart.
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