In this paper,a high accurate formula, T b=d ln (N+c)/(aN+b) ,has been developed from three functions with four parameters selected between boiling points of alkanes T b and their structural repeated unit number N.The formula is used to calculate 92 straight chain alkanes and branch chain alkanes.The results show that the maximum absolute error between the calculated values of these alkanes and their experimental values is less than 2K,and predictive residual sum of squares less than 0 8K....
