At present

the common methods for evaluating consolidation coefficient are the logarithm of time and the square root of time methods

both of which are graphical methods. In these two methods

there are some large influences of the man-made factors during graphical construction. The relationship between settlement-velocity of arbitrary moment and settlement-velocity of next moment is developed based on the one-dimensional consolidation theory

which provides a new method for evaluating consolidation coefficient by analyzing the measured data with the least square method. Then the rationality of the new method is verified through project cases study; and the results indicate that the new method can determine the consolidation coefficient with high accuracy and convenience to use. In addition

when the new method is adopted for evaluating consolidation coefficient

the latter measured data after an hour is not necessary

which means that the process of consolidation test can be accelerated.