Aiming at the characters, technique requirements and production problems of big shells, while adopting reverse design order, introduce a new automatic chamber gage inspection method. Based on information integration and real-time test, the method uses real-time inspection and fast response during automatic control to carry out directions over the whole automatic chamber gage inspection-to ensure the process is on the safe side, while offer accurate quantity indexes to technique parameters among the process. Experiment shows the method is secure and reliable, and can be widely used due to its fast response, real-time test process and high precisions.