The ascorbyl palmitate was determined by the improved iodimetry and compared with iodimetry and silicon molybdenum blue spectrophotometer method. The results showed that there were slight differences among the results determined by the common methods. The result by the iodimetry according to Food Additive Manual was leaning high and poor repeatability because of the turbid solution; the result by silicon molybdenum blue spectrophotometer method has a higher sensitivity, but needs more reagents and longer determination period. No significant difference between the results in GB 16314-1996 and iodometry at 5% level. The improved iodometry was easier to judge the end point of titration and had a higher precision, since the color change of the starch indicator was more obvious. This method is easy and quick, and can be used for the daily determination of the ascorbyl palmitate.