Patent ID: 7582571

Claim:
A substrate processing method using a substrate processing apparatus including: a process container holding a substrate to be processed therein; first gas supplying means having flow rate adjusting means for supplying a first process gas to said process container; gas switching means disposed between said process container and said gas supplying means, said gas switching means switching supplying directions of the first process gas to a first direction for supplying to said process container or to a second direction for supplying to a gas exhaust line; and second gas supplying means supplying a second process gas to said process container, said substrate processing method comprising: a first step of controlling a flow rate of the first process gas to be a first flow rate by said flow rate adjusting means and supplying the first process gas in the first direction; a second step of discharging the first process gas from said process container; a third step of supplying the second process gas to said process container; and a fourth step of discharging the second process gas from said process container, in a repeated manner, wherein a step of stabilizing the flow rate of the process gas is set between a primary first step and a secondary first step performed subsequently to said primary first step, and said step of stabilizing the flow rate of the process gas includes: a step (A) of switching the supplying directions to the second direction by said gas switching means after said primary first step; a step (B) of reducing the first flow rate to a second flow rate by said flow rate adjusting means after said step (A); and a step (C) of increasing the second flow rate to the first flow rate by said flow rate adjusting means after said step (B).