This study aims to address key limitations of traditional formation testers in complex reservoir evaluation, specifically the inability to perform multi-azimuth pretests at a single depth for in-situ anisotropy characterization, and the lack of an efficient recovery mechanism after probe seal failures. To bridge these gaps, a novel integrated formation tester (EFDT-Union) was developed, which enables pretesting, fluid sampling, and site-wall coring in a single downhole run. The core innovation lies in a newly designed adapter module enabling a "dynamic probe rotation-stationary tool anchoring" mechanism. This allows the probe module to rotate freely by 0°~360° circumferentially while the main tool body remains azimuthally fixed, representing a pioneering technology nationally and internationally. To underpin the data interpretation workflow for this tool, an analytical solution for circular-probe pressure diffusion equations incorporating anisotropic probe coefficient formulas was established and validated with numerical simulations. A combined mobility estimation strategy synergizing the drawdown method (based on steady-state flow principles) and the buildup method (utilizing pressure transient analysis) was proposed. The buildup method employs derivatives of pressure with respect to specific time functions (characterized by slopes: -0.5 for spherical flow, 0 for radial flow) to identify flow regimes and employs linear regression to extrapolate formation pressure. Validation results confirmed high consistency between analytical and numerical solutions with pressure derivative deviations less than 5% during spherical and radial flow regimes. Field applications at an oilfield in the South China Sea successfully demonstrated: (1) Multi-azimuth pretesting at identical depths (e.g., at depth of 3370.3 m, a mobility ratio of approximately 1.67 between azimuths 172° and 350° was observed, providing direct evidence of near-wellbore in-situ permeability anisotropy). (2) The capability for rapid probe reorientation and resealing post-seal failure (e.g., a successful 89° rotation followed by a pretest at depth of 3369.9 m after an initial seal failure at 350°), ensuring complete data acquisition efficiently. Pressure transient analysis (PTA) at these depths illustrated significantly different spherical flow development times and mobilities between azimuths (e.g., ~301.6% mobility difference at 3370.3 m). Importantly, formation pressure values derived from drawdown and buildup methods are in very good agreement at the identical depth with average absolute errors less than 0.007 MPa (specifically 0.0069 and 0.0015 MPa in the field application), and mobility values derived from drawdown and buildup methods exhibited order-of-magnitude consistency with relative errors less than 31% (specifically 7.0%, 28.9%, and 30.8% in the field application), jointly corroborating the reliability of the interpretation methodology and the effectiveness of the tool design. In conclusion, the EFDT-Union system equipped with its novel probe rotation mechanism and its integrated interpretation methodology, significantly enhances pretest efficiency and data integrity in complex heterogeneous reservoirs through multi-azimuth testing at identical depths and relocation-enabled probe resealing at matching depths following initial seal failures, thereby effectively mitigating operational risks and reducing costs.