Study aim: The effect of balance exercises on textured surface on somatosensory, balance and spatial-temporal parameters of gait in people with multiple sclerosis Design: A clinical trial with a control group, with parallel groups, double-blind, randomized by block randomization method, on 30 patients. A random number table will be used for randomization. Settings and conduct: Location: Isfahan Exercises: intervention group:Balance exercises and simultaneous sensory stimulation control group:balance exercises . Trend: Obtaining patients 'consent and collecting demographic information, measuring and recording study variables in two experimental and control groups before and after exercise therapy intervention. Intervention program: 12 hours of therapy based on improving balance (6 weeks, one-hour 2 sessions per week). Blinding participants, evaluating and analyzing data Participants/Inclusion and exclusion criteria: Inclusion criteria: Diagnosis of a neurologist Weakness in somatosensory function based on sensory evaluation EDSS score 2 to 5.5 (for the ability to perform or complete gait tests according to previous studies) The ability to walk a distance of 25 feet with or without assistive device Ability to stand independently for 2 minutes Exclusion criteria: The underlying illnesses Receive corticosteroid treatment one month before the study Uncorrected visual disorders Exacerbation of symptoms Changes in medications during the study Attack 30 days before the start of the study or during the study Intervention groups: The intervention group will receive balance exercises and sensory stimulation simultaneously(standing on a textured mat.) and the control group will receive balance exercises. Main outcome variables: Fatigue, pain, spasticity, ataxia, muscle strength, sensory, static and dynamic balance, spatio-temporal parameters of walking