To evaluate the efficacy of Preoperative Marking of Incompetent Perforators on Doppler .A prospective study including 50 consecutive patients (70 lower limbs) who underwent surgery for varicose veins in between 2017–2018 were included for preoperative marking. “T” technique is a technique of Doppler marking of an incompetent perforator long limb of the T representing the course of the superficial vein and the junction of the T representing the site of perforator entering the deep fascia. Surgical correlation was done. The overall surgical detection rate of incompetent perforators was 263 / 280(93.2%); .The “T” technique of Doppler marking was found to be easy to perform and aided intraoperative detection.