Tests for myasthenia gravis include repetitive nerve electrical stimulation test, neostigmine methylsulfate test, serum antibody test, and thymus imaging test. 1. Repetitive nerve electrical stimulation test: the method is to stimulate the motor nerves such as ulnar, median and parasympathetic nerves repeatedly with low frequency (3-5Hz) and high frequency (above 10Hz). Most of the patients with myasthenia gravis can be positive after low frequency stimulation, but a negative result cannot exclude myasthenia gravis. 2. Neostigmine methylsulfate test: The initial muscle strength is usually recorded in the most symptomatic muscle of the patient. After that, Neostigmine Methylsulfate is injected into the patient’s muscles, and finally the changes in muscle strength are compared to make a judgment on the test results. 3. Serum antibody test: to detect the antibody of acetylcholine receptor in skeletal muscle, the antibody concentration of most patients is obviously elevated, and the diagnosis can be clearly defined in conjunction with the patient’s medical history. 4. Imaging of the thymus: Some patients with myasthenia gravis have thymic tumors or thymic abnormalities, and need to undergo enhanced CT scanning or magnetic resonance imaging. Myasthenia gravis has a variety of means of examination, the patient should actively cooperate with the doctor to carry out the examination, and if necessary, timely treatment.