Abstract: The multi-physics fields coupling sintering is a novel method for preparing components fast sintered under low temperature with powder materials. In order to investigate the electro- heating impact on shrinkage and densification of multi-physics fields coupling sintering during the rapid heating process, suppressed pure Fe cylinder sample was firstly heated to 825℃ at the preset heating rate of 50℃/s , and then cooled down to 400℃ without heat preservation. After that, the sample was heated at the same heating rate and cooled again between 825℃ and 400℃ for 5 cycles. The whole process was carried out by Gleeble-1500D thermal simulation instrument. Further, the sample was compared with those of traditional vacuum sintering. It is demonstrated that for the multi-physics fields coupling sintering the sample appeared severe contraction at low temperature during the fast temperature rising due to the heating shock. After 2 minutes' electro-heating impact cycle, the powder compact has been realized to relative density of 97.55%, compared with traditional vacuum sintering technology where the powder compact was sintered at 1125℃, the holding time was 60 minutes, the relative density is 85.70%. Finally, it can be concluded that the heating impact of multi-physics fields coupling sintering was a new method to realize density in comparison with the long holding time traditional vacuum sintering.