FMECA (Failure Modes, Effects and Criticality Analysis) is an effective systematic process to evaluate software safety. In this paper, the safety model of embedded systems is built by integrating the AADL (Architecture Analysis and Design Language) model with extension of Error Model Annex, and the FMECA is adopted as a qualitative safety analysis for AADL (Architecture Analysis and Design Language) model of embedded system based on AADL safety model. The traditional FMECA method is improved to be suitable for AADL model evaluation, and some safety properties are added into AADL error model annex in order to fill in FMECA check list automatically at AADL modeling design phase. On using the OVP (Over Voltage Protection) system, a case study is demonstrated the feasibility of modified FMECA for AADL model.