In semiconductor packaging and testing industry, the manufacturing process is considerably complicated. When there is occurrence of the deviation or dropping in good yield, must quickly identify the processing station which induces the abnormality in the assembly process. Then, resolve the issue and restore output volume to the normal production level. This study applies "Boolean Operation" as a fundamental system to explore and diagnosis the abnormality at processing station. So that staff can quickly lead into the key element related to increase the yields rate. As a result, no extensive analysis is required. Results of the study show that the system greatly enhances the ability of rapid diagnosis and response. Also significantly improve the efficiency of exploration and diagnostic of abnormality. As the evidences shown in the study, the technique clearly indicate the solving capability, furthermore, enhance the good yield and competitiveness of the company in the industry.