With the development of MEMS, the demands of micro-extrusion are increasing gradually. However, some problems such as the unavoidable scale effect occurring in miniaturization challenge the plastic process, mechanics and equipment. Warm micro-extrusion process is presented and the development of micro-extrusion is discussed. ABAQUS/Explicit FEM software is used to simulate the micro-extrusion to obtain the flow behaviour of the material in receptacle. The influences of equivalent stress, strain and extruding force on formability are investigated. It is found that the deforming non-uniformity in work can be improved through changing extruding velocity, the influence of extruding velocity on stress distribution is not obvious, the control of extruding velocity can reduce the extruding force effectively. Finally, the standard of convexity of extruding parts is initialized to evaluate the formability of micro-extrusion.