To observe the clinical effect of lower limb muscle abdominal electroacupuncture combined with PNF in the treatment of hyperextension of knee in patients with hemiplegia after stroke. Methods: Total 80 patients with cerebral apoplexy accompanied by knee hyperextension disorder were randomly divided into electroacupuncture group (26 cases), PNF group (27 cases), combined group (27 cases). Patients in the 3 groups were given basic treatment for stroke, the electroacupuncture group was added lower limb abdominal electroacupuncture treatment, the PNF group was added PNF technology treatment, the combination group was given lower limb abdominal electroacupuncture combined with PNF technology treatment, a total of 4 weeks. The frequency of knee hyperextension when walking 50 meters at maximum speed and the effective rate of Loudon's knee hyperextension were evaluated before treatment and 4 weeks after treatment. Lower extremity Fugl-Meyer Motor Function score (FMA-LE), standing up and walking timing test (TUGT) and walking function grade (FAC) were used to evaluate motor function and walking function. Berg Balance Scale (BBS) was used to evaluate the balance function. Results: After 4 weeks of treatment, the scores of FMA-LE, FAC and BBS in 3 groups were significantly increased compared with before treatment (P<0.05), the number of knee hyperextension and the time of TUGT used in walking at the maximum speed of 50 meters were decreased compared with before treatment (P<0.05), and the therapeutic effect of the combined group was significantly better than that of the other two groups (P<0.05). There was no significant difference between electroacupuncture group and PNF group (P>0.05). In addition, the effective rate of Loudon knee hyperextension in combination group was significantly higher than that in electroacupuncture group and PNF group (P<0.05). Conclusion: Both lower limb abdominal electroacupuncture and PNF can improve knee hyperextension disorder in stroke patients with hemiplegia to a certain extent, and the combined treatment of knee hyperextension disorder in stroke patients with hemiplegia has significant effects, which can effectively improve the lower limb motor function, knee stability and overall walking function.