High nickel-base alloy, such as G3, is famous for its corrosion resistant, high intensity and other characteristic, which is popular in petroleum extraction and other heavy industry. However its poor machinability is a big obstacle to launching this material in its application. This paper introduces the poor machinability and tool wear behavior in turning high nickel-base alloy-G3. Based on rough and finished turning, turning experiments were carried out according on cutting speed, cutting depth, coolant and etc. some improved processes were suggested. This paper will be beneficial and guidable in turning high nickel-base alloy and other similar high nickel-base alloy or stainless steel.