In order to quickly evaluate the production process and the development result of SAGD，six mathematical models which can be used as indexes to evaluate SAGD performance were proposed based on the injection and production data during SAGD and by using reservoir engineering methods. These six models include instantaneous steam oil ratio，cumulative steam oil ratio，cumulative production injection ratio，cumulative water steam ratio，water cut and cumulative steam retention ratio. Under the determined extreme instantaneous steam oil ratio，the variation between the degree of recovery factor and above evaluation indexes under different forecasting final-recovery factor were obtained to form standard templates.Then a promoted method used to evaluate SAGD development process and result was formed. This method was applied to the drainage area 15 of Long Lake Oilfield，Canada. The results show that the models of the instantaneous steam oil ratio， the cumulative production injection ratio and the cumulative water steam ratio can be used to dynamically characterize the effect of high water cut zone and top water zone on production. On the basis of initial recovery factor of 73%，the finally forecasted recovery factor can be increased to 80% if further adjustment methods are conducted.