Objective To investigate the therapeutic effect and safety of immunoadsorption therapy in patients with myasthenia gravis.Methods 40 patients with myasthenia gravis were randomly divided into two groups: control group (n=20) received conventional treatment, and Immunoadsorption therapy group (n=20) received Immunoadsorption therapy base on the treatment of control group.Two group were compared with Serum AchR-Ab,IgG、IgA、IgM, MG-MMT, clinical efficacy and safety.Results Compared with the control group, Immunoadsorption therapy group Serum AchR-Ab,IgG、IgA、IgM Significantly reduced (p0.05), MG-MMT scores were significantly lower(P0.05), and better clinical efficacy (p0.05); two groups of patients had no serious adverse reactions.Conclusion Patients with myasthenia gravis received treatment of immunoadsorption have better clinical effective, It is worthy of promotion.