The invention provides a glycemic control method with a glycemic control map as a tool. The glycemic control map is a map (as is shown the picture) composed of two tables and an innovative two-dimensional coordinate system. Ideal glycemic control can be achieved with only four steps: first, a lot of data such as blood sugar, diets, exercise, nutritional supplements, hypoglycemic drugs or insulin at different time points are recorded on the map, and a curve is drawn according to coordinate data; second, the change trend of the curve on the map and relevant data are analyzed, and the main reason causing high and low change fluctuation of blood sugar is found; third, a lot of factors affecting changes of blood sugar are tested and adjusted, and the optimum data combination is obtained; fourth, persistence is strengthened, and good life habits are developed. The glycemic control map reflects the causality of changes of blood sugar quietly visually in the mode of a graphic interface, achieves systematic and digitalized monitoring, achieves ideal glycemic control at a low economical cost with a method easy to learn, understand and operate and plays a positive role in prevention and reduction of diabetic complications.