1 Materials and methods THE tree-ring reported here is one of pine discs sampled at 3 200 m a.s.l. in Qongtelian Valley in the Tuomu’er Peak region in 1978. The local geographical and climate condition has been introduced in detail. An index series was obtained after the width of tree-rings on 5 different radii was measured andfitted by linear and negative exponential functional regression. Each annual ring has been separated on the whole to simultaneously measure △~(14) C and δ~(13) C of treerings. Cellulose was extracted by the standard chemical method, then oxidized by copper oxide to C0_2.Carbon isotopic analyses were performed with a Mat-252 mass spectrometer. Results are expressed in thestandard δ notation with respect to the PDB standard with a precision of 0.1‰. 2 Results 1 Materials and methods THE tree-ring reported here is one of pine discs sampled at 3 200 m asl in Qongtelian Valley in the Tuomu’er Peak region in 1978. The local geographical and climate condition has been introduced in detail. An index series was obtained after the width of tree-rings on 5 different radii was measured and fitted by linear and negative exponential functional regression. Each annual ring has been separated on the whole to simultaneously measure △ ~ (14) C and δ ~ (13) C of treerings . Cellulose was extracted by the standard chemical method, then oxidized by copper oxide to C0_2.Carbon isotopic analyzes were performed with a Mat-252 mass spectrometer. Results are expressed in the standard δ notation with respect to the PDB standard with a precision of 0.1 ‰ . 2 Results