This study was carried on for evaluation of the phaco prechopping technique on 25 patients (Group A) and using the divide and conquers (Group B) as a control group.In prechopping group, the effective ultrasound time was 19.36 seconds, In divide and conquer group the effective ultrasound time was 24.44 seconds.Four cases in the prechopping group had tear of the posterior capsule with vitreous loss, while this occurred in 3 cases of the divide and conquer group.The results obtained show that phaco prechopping is effective in reducing the ultrasound time and energy utilized inside the eye especially in group II nuclear hardness. It is also safe technique with low intraoperative complication rate; however it has a long learning curve.