If you cut out 500 calories a day and exercise regularly, you will lose about a pound every week.  This will also help you reduce your back fat.  Use a food diary or online food tracker to help you cut out 500 calories daily. These food trackers in addition to online calculators can give you an estimated total daily caloric intake to help you lose weight.  Everyone's needs will be different, so using a calculator can help give you a more specific calorie range. Do not cut out too many calories.  This can slow weight loss, lead to nutrient deficiencies or make you feel tired and fatigued.  In general, health professionals recommend to eat a minimum of 1,200 calories daily.  Cutting calories will help you lose weight, but without the cardio and back strengthening exercises, your back muscles will not get toned.  It’s important to include both diet and exercise to get your desired result. Even if you’re cutting calories to help reduce back fat, it’s still important to eat a balanced diet.  Including a variety of foods from each food group will help you consume an adequate amount of nutrients each day.  When you have a poor quality, unbalanced diet, this may work against your weight loss goals. Include protein at each meal.  Protein is an essential nutrient in your diet.  Foods like poultry, eggs, dairy, legumes, seafood or tofu provide adequate protein to your diet.  Aim for a 3-4 oz (21-28g) portion at all meals. Eat a variety of fruits and vegetables each day.  These foods are low calorie and nutrient dense making them great foods for a low-calorie diet.  Try making ½ your plate a fruit or vegetable to help support your weight loss. Lastly, it’s important to include healthy sources of grains like bread, rice or pasta.  Grains provide fiber and a variety of B vitamins important to your health.  If you can, choose 100% whole grains for more nutrients. When you're trying to lose weight and cut calories, managing hunger can be an issue.  It's hard to stick to a diet plan, if you're feeling hungry often.  Combining...

TL;DR in Chinese:
减少每天摄取的热量。 饮食均衡。 吃有饱腹感的食物来减少饥饿度。 不喝高热量饮料。 少吃不健康的美食。