The design scheme of the electronic equipment fault diagnosis base on the fault trees analysis and virtual instruments is presented, and the work process of diagnosis system is detailed introduced.

The fault diagnosis and property testing process of the electronic component of photovoltaic radar base on the testing of all important signal and analysis of fault trees are detailed introduced.

Faults are analyzed by means of an improved fault tree analysis, and several fault trees are built for every kind of faults, then make down-way quantity analysis with the minimal cut set theory.