Abstract: With the graphic method and nolinear programming, twelve structural-type properties and condensed-type properties of homologous straight-chain alkanes, such as the highest bonded molecualr orbital energy, the lowest bonded molecular orbital energy, ionization energy, half-wave potential of oxidation, normal boiling point, normal melting point, critical pressure, critical temperature, density, refractance, surface tension and vicosity, have been developed. The results show that strutural-type properties and condensed-type properties of straight-chain alkanes generally obey the homologous logarithm regularities, and various structural-type properties and condensed-type properties are very well correlated with logarithmic function, and correlation coefficients all more than 0.99. Using homologous logarithm regularities, various properties of homologous straight-chain alkanes are predicted, and the findings indicate that most of the predicted values correspond very much to the values in literature except that deviations for minority of beginning compounds are not ideal, and experimental points almost overlap on the curves drawn by the logarithmic functions.