In this research, we describe a series of seismic observations including the foreshock sequence of preceding the 5 April 2017 M=6, SefidSang (Fariman, Iran) earthquake, Razavi Khorasan province. Existence of an earthquake seismic station (JRKH), eight kilometers from the epicenter of earthquake, provides the opportunity to explore the precursors changes. We analyze two classes of seismological observables: the ratio between compressional wave and shear-wave velocity (Vp/Vs) and the seismic anisotropy. The purpose of this research is to investigate the feasibility of earthquake stress-forecast based on these two precursors. According to the research, it seems that if there is a dense three-component seismic network monitoring changes in anisotropy parameters or changes in the velocity ratio are monitored continuously, it would be possible to stress-forecast the impending earthquake.