In this talk, we consider a Cauchy problem of energy-critical fractional Schr＼"odinger equation with Hartree nonlinearity below the energy space. Using a method of randomization of functions. We prove that hte Cauchy problem is almost surely locally well-posed. Our result includes hartree Schr＼"odinger equation ($$extract_itex$$＼alpha=2$$/extract_itex$$ )