In this paper chemical forms and content of soil arsenic are discussed based on analytical data of thirteen soil samples collected from ten provinces of China. Part of the procedures of fractionation of phosphorus in soil proposed by Chang and Jackson (1937 ) were adopted in the experiment for the separation of arsenic in soil. Forms of arsenic separated from the soils were adsorbed-, Al-, Fe-, Ca- and oceluded-arsenates. Analytical results showed that the contents oaf the five arsenates mentioned above in the total contents of arsenic of the soils were 0-21.3%,1.1-9.0%, 1.0-16.3%, 2.5-45.8% and 32.0-86.3% respectively. It was also revealed that chemical forms of soilarsenic and its contents seemed to be closely related to the geographical distribution of soil types. With the zonal distribution of the soils in China, the occluded-arsenate was gradually decreasing, but the adsorbed and Ca-arsenates were gradually increasing from the south to the north and from the east to the west.