I am 68 kilogram i want lose 8 kilo how i lose it?

Weight loss: You will not lose weight without changing your diet habits. Exercise is wonderful for numerous reasons but it will not help you lose weight unless you change your diet habits. There is a saying that you can't out exercise a poor diet. I would suggest a journal to keep track of your diet. Consulting with a nutritionist would help you greatly.

Losing weight.: Eat healthfully. Try to eat at least 5 servings of vegetables & 4 of fruit per day. Increase nutritional fiber. Avoid refined sugar & junk carbohydrates. Avoid alcohol, sweetened juices, soda & caffeinated beverages. Aim for 7.5 to 8 hrs of sleep / night. Hydrate w at least 64 oz of water / day. Calories burned must > calories consumed. Do both cardio & weight training.