Abstract: To overcome the shortage of available data analyzing methods which needs supplement test to be applied in the case of non-conservative tracer, some suitable transformation are conducted on the analytical solution describing onedunension river strewn water mass tracer test under the condition of instantaneous injection of non-consemative tracer and two linear regression equations are deduced in the paper.With application of cmxelation coefficient extreme method to the equation with two independents, the,quation estunating average velocity of stream is derived.And with application of linear regression method or linear-schematic method to the linear equation with one independent, the values of two linear constants may be estimated and based on the results of the estunat,d values of the two linear constants, the values of longitudinal dispersion coefficient and first reaction rate k may be calculated.The main appliration steps of the method is illustrated with an example.