【Objective】Potassium-solubilizing bacteria (KSB) are considered key plant growth-promoting bacteria for the sustainable development of ecological agriculture due to their unique advantage of potassium solubilization. To fully explore the resources of potassium-solubilizing bacteria in the environment, the changes in the characteristics of soil potassium-solubilizing bacterial communities were investigated in this study under various enrichment strategies. 【Methods】By using a potassium-solubilizing bacteria enrichment medium (KM),with a bacterial enrichment medium (BM) as a control, the study employed liquid (L) and solid (S) culture methods to continuously enrich and culture potassium-solubilizing bacteria in the test soil samples through three consecutive passages (1st, 2nd, and 3rd). The culturable microbial enrichments from each passage were collected, and high-throughput sequencing technology was used to analyze the 16S rRNA genes in the soil background and the enrichments. This analysis aimed to evaluate the proportion of culturable bacteria or potassium-solubilizing bacteria in the soil background bacterial community, as well as the community composition and diversity patterns under different enrichment strategies. 【Results】The results indicated that the bacterial diversity enriched by both media BM and KM was significantly lower than that in the background soil and the bacterial diversity in KM enrichments was significantly higher than that in BM enrichments. A total of 17 phyla, 38 classes, 91 orders, 145 families, and 267 genera of bacteria were detected in both L-KM and S-KM enrichments, with the most significant proportion at the phylum level accounting for approximately 29.31% of the soil background bacteria. The number of bacterial taxa enriched with L-KM medium was higher than S-KM at all levels. At the phylum level, the dominant phyla in L-KM were Firmicutes and Proteobacteria while in S-KM, the dominant phyla were Actinobacteriota and Proteobacteria. At the genus level, groups with distinct physiological and metabolic characteristics were enriched through three consecutive passages. Among them, the dominant genera in L-KM were Aminobacter, Chelatococcus, Cupriavidus, Hydrogenophilus, Microvirga, Paenibacillus, and Phenylobacterium. The only genus in S-KM that overlapped with L-KM was Cupriavidus, while other dominant genera included Burkholderia, Luteibacter, Massilia, Pseudomonas, and Ralstonia. Compared with known potassium-solubilizing bacteria databases, only 50 known genera were enriched in the KM medium, while unknown potassium-solubilizing bacteria accounted for over 81%. Using null model inversions to analyze the bacterial community assembly process during continuous passaging enrichment under different media, it was found that deterministic processes dominated the changes in community structure from the soil suspension inoculation to the first-generation media, while stochastic processes, mainly genetic drift, governed the intergenerational bacterial community succession. 【Conclusion】These results indicate that the composition and form of the medium are the main factors influencing the culturable potassium-solubilizing bacterial community, but continuous passaging enrichment does not lead to homogenization and simplification of the community structure. A relatively large number of both known and unknown potassium-solubilizing bacterial genera can be obtained under different enrichment strategies and used to enrich the existing resource bank of potassium-solubilizing bacteria. This can provide valuable insights for further development and utilization of these bacteria.