Recently, Wearable robots are considered as a promising way to suppress oscillations of patients with essential tremor. However, to suppress the oscillation effectively with them, degrees of freedom (DOFs) affected by tremor must be detected. In this paper, we proposed a method to detect the oscillated DOFs easily and accurately by using hand acceleration and posture of upper limb. Through the experiment, we confirmed that the proposed method was able to detect the oscillated DOFs more than 80%. As a future work, to make the proposed method more easy process, we try to use non-contact posture measurement system such as KINECT^[○!R] instead of the contact equipment.