For the concreting construction and running process of north anchor foundation of Runyang suspension bridge, the three - dimension finite element simulation model considering the interaction of anchor foundation and soil is founded based on the secondary development of Marc. During the construction process, the change of groundwater level results in the change of the water pressure under foundation, and then the change of the distribution of contact stresses. By the numerical simulation from the construction to running process, the change law of the contact stresses of gravitational rock - socketed anchor foundation is opened out. By the computation for the engineering example, during different stages of concreting construction, though the contact stresses of different parts of anchor foundation take on different characters，the contact stresses of north anchor foundation from the concreting process to running process satisfy the request of design as a whole.