a mri guided high - intensity focused ultrasonic therapeutic system comprises : a mri apparatus and a high - intensity focused ultrasonic therapeutic apparatus . said mri apparatus includes the first treatment bed and said high - intensity focused ultrasonic therapeutic apparatus includes an ultrasound transducer and a moving and positioning means , which drives said transducer to move in respective directions . wherein , said moving and positioning means is placed outside of the bore of the mri apparatus during treatment and a supporting rod , which can extend into the bore of the mri apparatus , is connected to said moving and positioning means at one end and is connected to said ultrasound transducer at the other end . in the system provided by the present invention , said ultrasound transducer can move in multiple orientations , freely move without any limitation of space under the treatment bed , brings less interference to the mri apparatus , fully exerts the function and efficiency of the mri apparatus and achieves the best therapeutic effects .