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Background: Patients with stroke frequently experience walking dysfunction. Core training can help improve balance and walking function in patients with stroke. However, core training movements in clinical practice are numerous and differently targeted. Therefore, this study will investigate the improvement of walking function in patients with combined diaphragmatic breathing maneuver (DBM) and draw-in breathing technique (ADIM) training. Methods: This single-blind, randomized controlled preliminary will analyze the viability of DBM combined ADIM training versus routine rehabilitation therapy in patients with stroke with early to mid-stroke. Patients will be randomly assigned to either the DBM and ADIM training or the routine rehabilitation training. We will recruit 42 stroke inpatients from the Second Rehabilitation Hospital of Shanghai who meet the trial criteria and measure the balance and walking functions and improvement of that after 4 weeks of intervention. The primary outcome is the 10 m maximum walking test (10MWT). The secondary outcomes indices include the limits of stability test (LOS), Berg balance scale test (BBS), Functional Ambulation Categories test (FAC), Timed Up and Go test (TUG), trunk impairment scale test (TIS), ultrasound indicators of the diaphragm and transversus abdominis (UI), rhythmic weight shift test (RWS), walk across test (WA), Fugl-Meyer assessment of lower extremity (FMA-LE), and Barthel index of ADL test. Discussion: The primary objective of this project was to investigate the effects of DBM combined with ADIM on balance capacity and walking function for patients with early to mid-stroke. The outcomes of this study will hold significant implications for future clinical applications in rehabilitation. Trial registration: Chinese Clinical Trial Registry (ChiCTR), ID: ChiCTR2100054897. Registered on 28 December 2021. [ABSTRACT FROM AUTHOR]