In this report, we propose two new methods for measuring multidimensional displacement vector using instantaneous ultrasound signal phase, i.e., the multidimensional autocorrelation method and the multidimensional Doppler's method. In order to realize high measurement accuracy, respective displacement vector measurement methods are combined with our proposed useful lateral modulation method, i.e., the lateral Gaussian envelop cosine modulation method. We further report measurement accuracy evaluated through simulations. These methods can be applied to tissue strain measurement, blood flow measurement, sonar measurement, etc.