The building in test of the aircraft could identify the fault on the automatic flight control computer when the automatic flight control computer is broke down. The crew on ground deliver the automatic flight control computer to supplier for testing and maintenance,which is wasting time and ineffective.we design the general automatic testing platform for this problem.We identify the interface and functiona simulated by the general automatic testing platform by researching relationship of the automatic flight control computer. The general automatic testing technology include hardware platform based on PXIe、PXI and GPIB bus architecture and software platform described by ATML language based on IEEE standard,which make the hardware extensible free and software independent to each other are portable independent of hardware and operating system. We design the test methods and test flow of the functional modules based on the relationship、function and architecture of the automatic flight control computer. The test suite are designed by ATML language. The general automatic testing technology perform well and effective in the tryout of consumers.