Follow-up traffic mix qi activity at least two kinds of gas source, one of the air to active gas source, the other one (or more) air through the regulator adjusting flow, and its active air change to cooperate with each other to form a gas mixing equipment, and through the calculation of flow, signal transmission, feedback, command and control, proportional fixed process, such as two or more air mixed.Follow-up flow mixer has high mixing accuracy, and can mix liquefied gas with air or other industrial gases in proportion to meet the needs of users.Follow-up flow mixer can be especially used as a gas peak change, control process complex industry, or play an excessive role, as a backup air source. Follow-up flow mixer can be used in many special areas requiring multi-gas mixing.