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The physical properties of metal complexes that are present in many places are due to the ligand field splitting of the d-orbital of the central metal ion, and the series representing the relationship of the ligand field splitting is called a spectrochemical series. This spectrochemical series represents the relationship of the ligand field splitting in the octahedral hexa-coordination structure, but no equivalent index has been shown in the tetrahedral four-coordination complex. In this study, we have investigated the creation of a novel spectrochemical series in tetrahedral four-coordinated metal complexes. As a result, it is possible to accurately understand the ligand field splitting of the tetrahedral four-coordinated metal complex, and to more effectively apply the energy for obtaining a spin crossover phenomenon in which the magnetic spin state reversibly changes. As a research flow, first, a tetrahedral structural model is created, and then the ligand field splitting is calculated using the DV-Xa method to create a spectrochemical series. As a result, we succeeded in creating a spectrochemical series of tetrahedral metal complexes. It has been found that the spectrochemical series of tetrahedral four-coordination complexes tend to hold as they are in octahedral hexa-coordination complexes to some extent, but there are cases where the series does not hold according to the peculiarity in the case of the four-coordinated metal complex.