Abstract: The present invention relates to a method of producing xylitol and arabinose at same time from hemicellulose hydrolysates, material rich in xylan is hydrolyzed by acid or enzymes to obtain hydrolysate mostly containing xylose and arabinose, then inoculated in Issatchenkia orientalis S-7 and/or Issatchenkia occidentalis LJ-3 to eliminate the inhibitor of microbes, after that/or at the same, inoculated a yeast of Candida tropicalis which can consume the glucose, transform the xylose to xylitol and can not consume the arabinose, and fermented, then fermented liquor containing xylitol and arabinose is obtained. After separation, xylitol with purity more than 99% and arabinose with high purity are obtained. After concentration and crystallization respectively, crystalline xylitol and crystalline arabinose are obtained respectively.