Based on the analysis of ingredients of rock expanded ammonium nitrate explosive(EANE),it is concluded that the decisive factors affecting the freeze resistance of EANE cannot expand ammonium nitrate and sawdust,but composite oil phase,an effective technical approach to manufacture freeze resistant EANE is introduced. When antifreezing agent is added into composite fuel oil,the freezing point of composite fuel oil can be reduced. Composite fuel oil may contain some kinds of antifreezing agents and other combustible agents,and its freezing point was tested. Explosion performances of freeze resistant EANE were tested after being frozen at -18 ℃ for one week. It is shown that EANE with good freeze resistance and explosion performances can be manufactured by addition of antifreezing agent into composite fuel oil. The composition of composite oil phase with satisfactory freeze resistance is diesel oil:ozokerite:paraffin:surfactant:glycerin:antifreezing oil:polymer=70:7.5:5:5:5:2.5:5, and its freezing point is 31.5 ℃. Detonation velocity,sympathetic detonation distance and brisance of EANE prepared with this composite oil are 3 546 m·s^-1,5 cm and 13.7 mm respectively.