Abstract: With the continued advancement of deep-sea oil and gas exploitation and offshore wind energy development, the safe and stable operation of floating structures has become a critical issue. As a key component of the mooring system, the performance of anchoring foundations directly affects the overall structural safety. In recent years, tandem plate anchors, characterized by higher bearing capacity and enhanced stability, have attracted increasing attention. However, the influence mechanisms of internal configurations on their embedment behavior remain insufficiently understood. This study systematically investigated the effects of internal configurations of tandem plate anchors on their embedment behavior through a series of drag embedment tests. Particular emphasis was placed on evaluating how the connection type between the front and rear anchors, the inter-anchor spacing, and the specific types of plate anchors involved (tandem drag-embedment anchors, tandem vertically loaded anchors, and mixed configurations of drag-embedment anchor and vertically loaded anchor) affect the embedment trajectory and installation bearing capacity. The results indicate that the padeye-to-fluke connection could enhance both embedment depth and installation capacity. An anchor spacing of no less than three times the fluke width effectively mitigated interference effects. Among the tested configurations, the arrangement with a drag embedment anchor as the front anchor and a vertical load anchor as the rear anchor exhibited the best performance, achieving a maximum installation capacity up to 1.3 times the sum of the corresponding single-anchor capacities. This study provides a theoretical reference for the optimal design and engineering application of tandem plate anchors in deep-water mooring systems.