Abstract: Laws of nature occupy a central role in scientific practice and have raised profound philosophical questions. Currently, there are two major competing theories of laws of nature in philosophy of science: Humeanism and dispositionalism. According to Humeanism, laws merely supervene on the distribution of mosaic in spacetime, whereas dispositionalism claims that laws reveal the dispositional properties of things. This paper expounds the key perspectives of both positions and their applications in classical mechanics and quantum mechanics. To gain a deeper understanding of the differences between the two, we introduce the concept of grounding and demonstrate through specific examples its unique value in addressing philosophical issues related to laws of nature. 

 Key Words: Laws of nature; Humeanism; Dispositionalism; Grounding

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