The Ministry of National Security of People's Republic of China (PRC) is the functional department of the State Council to safeguard national sovereignty and interests. It can exercise the functions and powers of public security organs in investigation, detention, preliminary examination and execution of arrest as stipulated by the Constitution and laws.

The internal security detachment is responsible for detecting cases that endanger national security and society.

2. The tendency of authority is different.

One is defense, and the other is prevention. In other words, the National Security Bureau solves the trouble and the National Security Bureau finds the trouble.

People's Republic of China (PRC)'s Ministry of National Security is responsible for developing some devices to ensure that American communication secrets are not stolen by the enemy.

3. Different in nature.

The Ministry of National Security of People's Republic of China (PRC) is the functional department of the State Council to safeguard national sovereignty and interests. It is the largest intelligence department, responsible for collecting and analyzing foreign and domestic communication materials.

The domestic security detachment is the work content, requirements and objectives undertaken by the domestic security department of the public security organ in maintaining national security and social and political stability in accordance with the relevant provisions of the Constitution and laws, exercising the powers entrusted by the state.

References:

Baidu Encyclopedia-Ministry of National Security of People's Republic of China (PRC)

References:

Baidu encyclopedia-domestic security detachment