Abstract: Whan an one-way volume table is worked out by equation V=aD^b,ausual method for fitting this equation is to lineariz it firstly, then calculatethe parameters of a and b by Least-squares method. However, the method usedabove is not optimum. It is suggested that the precision of one-way volumetable will be increased by application of Modified Simplex Method to furtheroptimizing the parameter a and b of the equation V=aD^b.

Key words: Modified simplex method, Optimum fitting one-way volume eqution