The heat transfer characteristic of propylene glycol-water (PG-W) mixture with different concentrations in shell side of spiral wound heat exchanger (SWHE) with different geometric parameters was studied numerically. The results show that small outer diameter of tube, large barrel core diameter and longitudinal spacing of tubes leads to large heat transfer coefficient. The influence of barrel core diameter and outer diameter of tube on heat transfer coefficient increase with the increase of concentration. Economic index was established and found that adding materials for changing barrel core diameter and outer diameter of tube will improve economic index.