This is a single group subject, open-label, self-controlled, 3 periods, multi-doses administration trial. 12 Healthy Chinese volunteers satisfying inclusion criteria were enrolled with equal number of male and female. Each subject goes through a 7-day Run-in period to eliminate the remaining L-carnitine like substance in the food to ensure the baseline level of endougenous L-Carnitien is stable；In period III, during the first 4 days，all healthy subjects take oral Propionyl-L-Carnitine 1g twice daily; on day 5, all healthy subjects take oral Propionyl-L-Carnitine 1g during fasting.