In order to study the effect of the heating rate on the microstructure of TC4 titanium alloy during high temperature compression deformation under the condition of electric field, cylinder samples with grain size of 8 μm and 20 μm were compressed with different heating rates at 700 oC using Gleeble-1500D thermal simulation instrument. The results show that grain size of 8 μm samples becomes finer and more equiaxial after high temperature compression deformation under the action of AC current, equiaxial α phase increases and flake β phase decreases. In addition, the distribution of equiaxial α phase and flake β phase becomes narrow. Both low current and high current heated TC4 titanium alloys of 20 μm have honeycomb structures, and honeycomb structures of low current heated TC4 titanium alloy is more pronounced. With the same grain size of TC4 titanium alloy, the higher the current, the finer the microstructure, and the more equiaxial.