Post-Quantum Secure Module MiXin App is an office-oriented instant messaging tool designed for industries including Party and government agencies, discipline inspection commissions, and state-owned central enterprises. By leveraging quantum encryption, its security capabilities have been enhanced through dual encryption protection built with national cryptography algorithms and post-quantum cryptography (PQC) algorithms. It also integrates a national cryptography chip and a quantum random number generator (QRNG) chip in a quantum super SIM card. It supports functions such as one-on-one chat, group chat, file transfer, audio and video calls, conferences, and online documents, meeting the requirements of high-security users including Party, government, military organizations and state-owned central enterprises for mobile secure communication and collaborative office scenarios.