The activities of sucrose synthase cleavage function, acid invertase, NAD+-sorbitol dehydrogenase and sorbitol oxidase were significantly enhanced by OA. Meanwhile, OA-treated apricot fruit showed lower sucrose synthase synthesis activity. The degradation of sorbitol in apricot fruit was accelerated by OA treatment. Our results indicate that higher chilling tolerance of OA treated fruit was associated with higher content of reducing sugars (glucose and fructose).