A Swallowing neuromuscular electrical stimulator (LGT-2350A) from Guangzhou Longzhijie Medical Equipment Co., Ltd. was used. The electrodes are arranged sequentially on either side of the anterior midline of the neck. The parameter-selected electrical stimulation frequency is 80 Hz[12] (bidirectional square wave, pulse wave 300 microseconds, current intensity 10 to 25 mA） for 20 minutes each time, 1 time per day, 5 days/week, 4 weeks of treatment. which are limited to 20 min/time, 1 time/day, 5 days/week, and 4 weeks, respectively.

tDCS treatment (specific method: microcurrent stimulator, stimulation electrode (3 cm×4 cm gelatin sponge), anodic stimulation site is the pharyngeal sensorimotor cortex area (between C3/T3 on the left[14], between C4/T4 on the right); the supraorbital area is the site of cathodic stimulation. The direct current intensity is 2.0 mA (20 min/time, 2 times/day) for two treatments (respectively, yin and yang alternating treatment), with an interval of at least 1 h, 5 days/week, and 4 weeks.

tDCS combined with intraoral induction electrical stimulation. The patients were first treated with tDCS (the method is the same as that of the control group B) for 20 people twice a day and then given intraoral induction stimulation (the specific method is the same as that of the control group A) for 20 minutes, once a day, for 4 weeks.

Intraoral induction electrical stimulation therapy (specific method[13]: hand-held electrode rods were used to stimulate the mandibular hyoid muscle, digastric muscle, anterior abdomen, and other muscles of the three groups. Parameter setting: the frequency is 80Hz, the wave width is 1ms, the intensity is set to the muscle contraction, each electrical stimulation is 3s, intermittent 10s, 20min/time, 1 time/day, 5 days/week, 4 weeks is limited.

The patient was instructed to stay in a Sitting or standing position, drink 1 ml, 3 ml, and 5 ml of water, respectively, and drink 30 ml of water when the patient did not show abnormal manifestations. The severity of dysphagia is classified as 1-5 according to the time the patient drinks water, whether there is choking, swallowing in fractions, etc., and the lower the rating, the better the swallowing function. (1) significantly effective: the MWST assessment reached grade 1 or decreased ≥ grade 2. (2) Effective: MWST assessment is reduced by 1 level. (3) Ineffective: There is no change before and after the MWST assessment. Total effective rate = (significant effect + effective) number of cases/total number x 100%.

The patient's oral feeding function is according to the type of food and the way the patient eats. 1 point: No oral food at all; 2 points: Dependent on tube feeding, can try to eat the smallest amount; 3 points: 3 points: tube feeding, oral ingestion of food or liquid of single quality；4 points: Completely oral consumption of a single quality of food; 5 points: Completely oral consumption of a variety of food qualities, but special preparation or compensation is required; 6 points: Eat completely by mouth, but with special food restrictions; 7 points: No restriction on complete oral feeding, The score is directly proportional to the swallowing function.

1 point, the bolus does not enter the airway; 2 points, the bolus enters the airway, is above the level of the vocal cords, and is ejected from the airway; 3 points, the bolus enters the airway, is above the level of the vocal cords, and is not ejected from the airway; At 4 minutes, the bolus enters the airway and is ejected from the airway; 5 points, the bolus enters the airway, but does not eject from the airway; 6 points, the substance enters the airway, reaches below the level of the vocal cords, and is ejected into the larynx or outside the airway; At 7 minutes, the bolus enters the airway and reaches below the level of the vocal cords, but the force is still not ejected from the trachea; At 8 points, the bolus enters the airway, reaches below the level of the vocal cords, and is unable to eject. PAS was assessed according to the Videofluoroscopy Swallowing Study (VFSS) or Point-of-Care Fiberoptic Endoscopic Swallowing.