The ancient Chinese people created the study of fate, accumulating valuable experiences derived from it. After a long period of developing fate studies, it was discovered that if a person's four pillars of destiny contained a "shen" (auspicious spirit), it was auspicious, and if it contained a "sha" (inauspicious spirit), it was ominous. This led to the emergence and dissemination of the theory of auspicious and inauspicious spirits in fate studies. When studying fate and deducing fortune, the concept of stars and spirits inevitably comes into play. Stars and spirits have auspicious and inauspicious aspects, affecting each differently. The auspicious ones are called stars or spirits; the inauspicious ones are called killers or sha. Encountering auspicious ones makes one more fortunate, while encountering inauspicious ones makes one more unfortunate. However, for an auspicious star to be truly auspicious, it must meet the conditions of "auspiciousness"; otherwise, the auspiciousness will not manifest, and the same applies to inauspicious spirits. Therefore, when studying fate and judging stars and spirits, one must comprehensively analyze the gains and losses of the necessary conditions and avoid making definitive statements upon merely seeing a spirit or sha; doing so would be a grave mistake. Moreover, the same stem and branch may sometimes contain both stars and spirits. The judgment of spirits and sha is a component of fate and fortune analysis, serving as an important reference for auxiliary judgment under the premise of balancing the five elements' prosperity and decline in fate and fortune analysis.