We present estimations of a Cobb-Douglas production function with a steady change in TFP (total factor productivity) for the Russian economy, using quarterly data for the favorable period 1998Q3-2008Q2 and the period 1995Q1-2010Q2 as well. Compiling our baseline data on capital and labor adjusted for utilization, we explicitly present estimations of the coefficients (the capital distribution ratio and TFP) of production function, which show that TFP is the major growth source, followed by the capital contribution. We also show results of measurement of Russia"s GDP gaps as the differences between potential and actual GDPs based on the production function and the Hodrick-Prescott filter.JEL classification: E01, P24