hair samples from about 200 sample sites are collected. These sites cover 103 counties and different types of natural conditions and are far from cities(or towns) or polluted areas.The hair As are analyzied by hydro-atomic fluorescence spetrophotometry and the data are caculated by computer.The results show Chinese hair As contents are between 0.004 and 9.999μg/g. The median is 0.56μg/g. The arithmetic mean is 0.927±1.213μg/g and the geometric mean is 0.571μg/g.There is no significent difference between sexes and ages. The results of Pelson x2 and Shapio-Wilk W tests show that the As content in the same physical geographical area has a logarithm normal dis tribution.Hair As contents in the South are significently higher than that in the North.The geometric means are 0. 2-0. 4μg/g in medium-temperate zone and 0.4-0.6μg/g in warm-temperate zone. In north-subtropical zone the hair As geometric mean is 0. 767μg/g and in medium-subtropical zone, south-subtropical and tropical zones, it is higher than 1.00μg/g.There is no difference in the same physical geographical zone.Hair AS content in the Qinghai-Tibet Pleatu area is also low(the geometric mean is 0.267μg/g).At last, the standard level of hair As content for chronic arsenism areas in China is also discussed.