Air-ground communication plays an important role in air traffic control. Many incidents have relation to air-ground communication faults. A set of system parameters and guide words for the hazards identification and analysis is proposed. Combineing BPMN with HAZOP, the negative deviation from normal operation is detected. Meanwhile, an ontology model aiming at risk identification and analysis is also implemented using Protégé tool. With the construction of description logic among the ontological concepts of TBox, the reasoning approach is realized and validated via real incident case. This method has benefit on risk description and category by standard terminology to overcome shortcomings of natu ral language description. It is also useful to classify risk items clearly for further post statistic analysis.