【】 Objective:_{Ultrasonology central venous catheter (PICC) in the value of follow-up after surgery.}Methods:_{Ultrasonic observation of 322 patients with PICC catheter in the position of the intravenous line and go, in the venous lumen and blood flow.}Results:_{263 cases of PICC catheter and no abnormalities in the venous lumen, as smooth and parallel tube high echo, venous blood circulation chang, without thrombosis; 45 cases with thrombosis, characterized by intravenous low echo, probe on the lumen is not disappear, blood flow signals narrowing or disappear; 6 cases with the puncture point subcutaneous hematoma; 5 cases of guide wall surrounding with attachments form; 3 cases of catheter lumen see blockages.}Conclusion:_{PICC ultrasound in patients with severe postoperative follow-up is important, postoperative thrombosis is the main complication.}