Two ways to develop vacuum micro-electronic devices (VMED) in the microwave and millimeter wave bands, i.e. the VME distributed amplifiers (VMEDA) and VME microwave tubes (VMEMT) are introduced. A brief review about the development of vacuum and solid state MM-wave devices, a discussion on the two kinds of VMED's merits and problems, and some ideas on developing mm-wave VMED in China are given.