The distribution feature of intermediate and deep focus earthquakes(M≥ 6.0) in China and relationship between it and seismic activity in whole nation and the main seismic areas of China are analysed. The deep focus events are distributed in Northeast China, concentrated in a region of 2×2° of which central point is 42° N, 130°E. Average depth of the events is about 560 km. The intermediate shocks are distributed along a zone of which strike is NE～SW from the East China Sea, through Taiwan to Dongsha Islands, with depth within 250 km and a mean value near 150 km. There is a period about 63 a in activity of the intermediate and deep focus earthquakes in China. The activity of the intermediate shocks of Southeast China comes after the deep focus shocks of Northeast China. After intermediate and deep focus earthquakes, M_S≥ 7.0 shallow earthquakes of Taiwan region and M_S≥ 6.0 shallow earthquakes of northeast Qinghai Xizang block may occur. The seismic activity of Qinghai Xizang block generally begins in northern part first, then migrates progressively southward along the eastern part of the block. After shallow earthquakes controlled by the eastern stress field and intermediate and deep focus earthquakes quieted for about 20 a,the Huichun M7.0 deep focus earthquake and the Taiwan M7.6 earthquake may be a signal of aggravation of action of the Pacific plate and beginning of relative seismic activity in China.