Abstract: An extra?heavy oil reservoir developed by horizontal well steam drive process appears two states of steam flooding and gravity drainage in process of driving force and gravity, it is known as vertical well steam injection?horizontal well production steam drive (VHSD) process. This paper describes this mechanism, steam flooding mode, injection?production parameters and adjustment and control policy by means of analytical and numerical simulation methods. The study shows that in the area of Well Zhong?32 in Fengcheng oilfield, the suitable operation conditions for the Qigu extra?heavy oil reservoir developed by VHSD process are that vertical well uses rotating steam injection with steam injection rate of 70 t/d, steam quality at the bottom of higher than 70%, operation pressure of 2.5 MPa, and production/injection ratio of 1.2. The main control technique is the optimization of steam injection spot, sub?cool regulation, injection?production balance and working system optimization. The expected recovery efficiency can reach 50%