The magnetic field that magnetic field intensity size and direction do alternative change of the periodicity at any time is called the reversal magnetic field . Utilize reversal is do the method to use for the human body to called the different name and extremely fasten the magnetism law by magnetic field. The reversal magnetic field has the important one to treat the function and value clinically , Improve blood circulation、ease pain、the function that diminish inflammation and subside a swelling . Its merit comes into force fast、there are few side effects. To bone joint disease、soft organization of muscle sprains and dampen、inflammation、nerve ache、the blood of traumatism quality waits swollenly , there is better curative effect .