The processing technology of marine diesel engine block is complicated. In order to evaluate the process reliability of the block, a marine diesel engine block process reliability evaluation system based on key features was developed. The management of block machining process information and the selection of key features could be realized based on the system, and then the assessment of the process reliability could be realized. The system provides a visual operation platform and decision support for quickly evaluating the processing strategy. The research results provide reference for the practical manufacture process of the block.