[New regulations for stress testing of securities trading and settlement systems are about to be implemented Critical information infrastructure units must be tested at least twice] On September 19, reporters learned that the "Guidelines for Stress Testing of Securities Company Transaction Settlement Systems (Trial)" are about to be implemented, and the China Securities Association is currently performing relevant procedures. Since soliciting opinions in September 2025, the "Guidelines" have been revised once, and the final version will formally put forward clear requirements for the stability of the securities industry's transaction settlement systems, thereby enhancing the reliability of the system. The "Guidelines" are expected to implement a number of hard measures: securities companies at least every year Conduct a stress test of the transaction settlement system at least twice a year for critical information infrastructure units; timely supplementary testing is required in five types of situations such as major system changes and large market fluctuations; securities firms should attach great importance to the system stress test results. If they find that system performance does not meet standards or there are major risks, they should report it in a timely manner and formulate a clear rectification plan within a time limit. The implementation of the new regulations aims to identify bottlenecks in the capacity and performance of the transaction settlement system, improve system stability guarantee capabilities, and protect the legitimate rights and interests of investors. (Reporter Lin Jian)