We experienced 4 cases of acute arterial occlusion (AAO) that needed additional fasciotomy after arterial reconstructive surgery. Case I was a woman of 58 years old who suffered from AAO caused by infiltration of intrapelvic cancer to the common iliac artery. Ninety-six hours after the onset of disease, vascular reconstructive operation and fasciotomy were carried out. Case 2 was a boy of 7 years old who suffered from AAO caused by seven hours of indwelling of bypass canula into the femoral artery during extracorporeal circulation. Thirty-eight hours after the onset of AAO, fasciotomy was carried out. Case 3 was a man of 73 years old who suffered from AAO caused by thrombus originating from the surgery of a ruptured abdominal aortic aneurysm . Seven hours after the onset of the disease, a vascular reconstructive operation and fasciotomy were carried out. Case 4 was a man of 65 years old who suffered from AAO caused by the migration of thrombus from a venous graft aneurysm. Four hours after the onset of the disease, a vascular reconstructive operation and fasciotomy were carried out. A11 four cases were suspect to compartment syndrome, and fasciotomy offered the benefits of limb salvage. Rapid fasciotomy is useful in cases suspected of compartment syndrome after a vascular reconstructive operation for AAO.