The regional data of Cd in surface and deep layer of soils in Weihai were collected to investigate the geochemical characteristics of heavy metal Cd based on regional geological background. The results suggest that the background and baseline values are 0.090×10^-6 and 0.056×10^-6, respectively. The regional soil environment quality of Cd element is generally good, only 3.42% of the region's surface soils and 1.17% of the deep soils exceeds the Ⅰ grade of National Environmental Quality Standards in Soils of China, and only 1.67% of the surface soils exceeds the Ⅱ grade of National Environmental Quality Standards in Soils of China due to contamination. The input of Cd in soils of the study area could be mainly classified into natural and anthropogenic sources. The natural sources dominated area of Cd accounts for 54.68%, in which a good correlation of Cd between the surface and deep soils and geochemical element combination characteristics of Cd with other heavy metals in surface soils could be detected; the distribution of Cd content in surface soils of natural area is mainly affected by the parent materials, the Mesozoic intermediate-acidic intrusive rocks control the distribution of Cd in soils of hilly areas, and the Quaternary sediments control Cd of soils in plain areas. In addition, the terrigenous sediment-dominated plains' surface soils have relatively higher level of Cd content, whereas the plain related to seawater generally has a lower Cd content. However, the anthropogenic sources-dominated area accounts for 45.32%, in which the natural properties of Cd in soils have been destroyed because of artificial interference, and the increasing of Cd content in surface soils could be attributed to human activities such as factories and mining activity.