Based on automatic control and monitoring technology, designs a automatic control and monitoring sub-system of the collective protection system, which detects the pollution condition by the annunciator sensor and raises the alarm, and adjusts fan speed automatically according to numerical value between in and out the shelter which measured by pressure sensor, and opens the drain tap to increase the Oxygen concentration when the concentration is too low. Experimentation and accouterment shows that the sub-system working is stability and satisfies the need of used.