The physical and technology temporal resolution of pulse dilation frame tube were studied by the classic formula, the mean field theory and the pulse dilation model. The influence of the parameters on temporal resolution was analyzed, which are the initial energy, the cathode biased, the ramp pulse and the drift distance, etc. The effect of the physical and technology temporal resolution in picosecond (ps) and the sub-ps time scale and the possibility of achieving sub-ps of temporal resolution were discussed. The results show that the physical and technology temporal resolution are restricted each other. The temporal resolution of tube is decided by the technology temporal resolution when temporal resolution is 5 ps time scale. The temporal resolution of tube is decided by the physical and technology temporal resolution when the temporal resolution is sub-ps time scale.