The migration of two potential contaminants, formaldehyde and acetaldehyde, from two paper materials into food simulant Tenax was studied. A rapid and simple one-step extraction-derivatization method combined with ultra high performance liquid chromatography was established for the determination of formaldehyde and acetaldehyde in paper packaging materials and food stimulants. The linear correlation coefficients (R2) were greater than 0. 9999 in the range of 0. 14-35. 7 mg/m2 for both formaldehyde and 0. 20-49. 1 mg/m2 for acetaldehyde, with detection limits of 0. 03 mg/m2 for formaldehyde and 0. 04 mg/m2 for acetaldehyde. The recoveries were 90. 1%-108. 6% for paper sample and Tenax. The migration behaviors of formaldehyde and acetaldehyde at different temperatures and migration times were investigated. Both for formaldehyde and acetaldehyde, the amount of migration gradually increased with time first, then decreased, finally reached a steady value. The migration rates of formaldehyde and acetaldehyde were differently influenced by temperature. After reaching a steady value, the maximum migration rate for formaldehyde was at 30℃, and for acetaldehyde was at 70℃ and 50℃. The migration rates of formaldehyde and acetaldehyde greatly varied, and the migration rate of acetaldehyde was far more than the migration rate of formaldehyde when reaching a steady value.