Flight test certification is an important part of civil aircraft development, and it is also a weakness that needs to be completed in the current domestic civil aircraft development. The long flight test cycle will bring great pressure on the cost of civil aircraft development, and the excessively delayed certification delivery plan will bring an adverse impact on the market competitiveness of civil aircraft products. Based on the current domestic civil aircraft development experience, this paper summarizes the types and characteristics of civil aircraft flight test, compares and analyzes the existing domestic and foreign civil aircraft flight test cycle data, and identifies the main factors affecting the domestic civil aircraft flight test cycle at the current stage in combination with the actual flight test process and engineering experience of domestic civil aircraft. Based on the analytic hierarchy process and the experience of actual flight test implementation cases, an evaluation and analysis model of influencing factors of civil aircraft flight test cycle was established, and the influencing factors at all levels were quantitatively analyzed. It is concluded that reducing flight test subjects can effectively reduce flight test cycle, and the optimization and improvement suggestions or feasible schemes are put forward for the specific influencing factors with higher priority. Suggestions on the control of civil aircraft development and flight test and the selection of flight test subjects before TIA( Type Inspection Authorization) are given for reference in subsequent civil aircraft development.