The solid-liquid phase equilibria (SLE) of the (1-octanol + n-alkane) systems have been investigated at temperatures from 268 to 333 K and pressures up to 220 MPa by the visual observation with a high-pressure optical vessel. In this work. (1-octanol + n-tetradecane) and (1-octanol + n-hexadecane) systems are discussed. The uncertainties of the measurements of temperature, pressure, and composition are within +/-0.1 K, +/-0.5 MPa, and +/-0.001 mole fraction, respectively. The solid-liquid coexistence curve and the eutectic point are found to increase to higher temperatures monotonically with increasing pressure in these systems. In order to describe the pressure (P), temperature (T), composition W relation of the SLE, a new simple equation with two exponents g and h has been proposed as follow: T = B(P) + C(P)x(g) + D(P)x(h) where B, C. and D are pressure-dependent coefficients and are expressed by the polynomials of pressure. It is found that the SLE diagrams of these two systems under high pressure can be correlated successfully by this equation.