Abnormal procedures are the important basis for the flight crew to handle emergency conditions. There is no current establishment method of procedures items, which makes unnecessary or omission may easily occur in the procedure items. This paper divides the abnormal procedures into four types: airworthiness regulation, function failure, route operation factor and model feature procedures, and provides the cooresponding procedure item establishment methods. Abnormal operation procedures are established based on “operation require”, through regulation inquiry, system security analysis (Failure Mode and Effect Analysis (FMEA) and Functional Hazard Analysis (FHA)), reference to similar type and etc. Those all makes the results more accurate. And then this result is iterated to optimize the CAS design. This method is verified to be able to establish procedure items by using it to develop some domestic civil aircraft fuel system abnormal operation procedures, and it makes the design result more in line with expectations of pilots.