Fuel saving is a very important and long-term action for airlines. Based on aircraft performance analysis, this paper presents fuel saving suggestions on weight, center of gravity and APU usage and taxiing before flight, and also presents economy flight fuel saving strategy suggestions on take-off, climb, cruise, descent, approach and landing phase. By the research of fuel saving measures in each detailed aspect of a flight circle, the paper suggests the method of well using flight planning tool to improve fuel consuming efficiency, with a case study and the comparison of different flight planning methods, and educes the conclusion that the integration IT solutions including flight planning and QAR(Quick Access Recorder) analysis systems from civil aircraft manufacture is a high performance-price ratio choice for airlines′fuel saving.