The total idea for waste water controlling was described and then the emission concentration limited of the chemical oxygen demand（COD）and the ammonia nitrogen（NH3N）for the Jinsha River, the Luanhe River and Dalinghe River were calculated respectively by twodimensional water quality model. The results show that the COD emission concentration limits of the three rivers were under the current standards. However, the NH3N emission concentration limits were all closed to or above the standards; the recommended COD and NH3N emission concentration limits were no more than 60 and 15 mg/L, respectively.

The wasting of the superheated steam or heating the oil reservoir not sufficiently might be caused by the uncertainty of steam injection period during the steam soak, therefore, and a two-dimensional, unsteady state mineshaft-stratum-oil reservoir mathematical model was established, and the temperature fields of the stratum and the oil reservoir were analyzed. Furthermore, the influences of steam injection period to the heat affected radius during the steam soak were discussed. The results show that the heat affected radius of the oil reservoir increases with steam injection period duration and reaches the maximum when the steaming for 5 d, then nearly no longer changed after that. The heat in the oil reservoir began to transfer to the stratum when the steaming for 3 d, and the temperature fields of the stratum and the oil reservoir are nearly the same for 6 d. The steam injection period should be controlled in 4~5 d during the steam soak.