Firstly，the development background and research significance of axial piston pump were described，and friction pair was pointed out as the key factor to restrict the development of axial piston pump． Then the research status of friction pair of axial piston pump at home and broad and the problems in current research were summarized． After that，the technical background，principle，development and application prospect of hydrodynamic-magnetic compound support ( HMCS) applied in axial piston pump was introduced． It was showed that the successful application of HMCS in axial piston pump can solve the difficult problems in traditional piston pump technology． Finally，the key technologies and research difficulties faced by the realization of the hydrodynamic-magnetic compound support were prospected，and the relevant research achievements that are helpful to conquer the key technologies were summarized． The hydrodynamic-magnetic compound support is of great theoretical significance and practical application value for the axial piston pump with high reliability and low viscosity medium using．