Abstract: A fixing method of carbon fiber bundle and a flexible gas permeable electric heating structure made thereof. The fixing method includes steps of: making multiple carbon fiber bundles each composed of at least two carbon fiber yarns intersect and touch each other to form a carbon fiber mesh as a meshed electro-conductive circuit; laying two load electrodes on the carbon fiber mesh in two different positions; and using a smocking machine to form multiple machine sewing threads for sewing the carbon fiber mesh with the meshed electro-conductive circuit and the two load electrodes at least one face of a flexible substrate to form the flexible gas permeable electric heating structure. The flexible gas permeable electric heating structure is advantageous in that it is uneasy to break, gas permeable and durable and a user can comfortably wear the flexible gas permeable electric heating structure.