Since the People's Bank of China first introduced overnight reverse repo operations at the end of June, this new monetary policy tool has seen increasingly frequent usage, with its operational timing expanding from the original month-end window to mid-month tax periods, month-start transitions, and other key junctures. This reflects the accelerating shift of the monetary policy framework toward price-based tools and the continuous refinement of short-term interest rate management.

Looking back at the operational trajectory of the past two months, the overnight reverse repo was first deployed at the end of June. At that time, three pressures converged simultaneously: the semi-annual assessment, credit expansion efforts, and accelerated local government bond issuance. The introduction of the overnight reverse repo precisely offset the cross-quarter liquidity gap. At the end of July, the People's Bank of China activated the overnight reverse repo once again and extended it into early August to complete the cross-month operation. In mid-August, the central bank employed this tool for the first time during the mid-month tax period, aiming to smooth out cash-flow fluctuations caused by tax payments. On August 24, the People's Bank of China again announced that it would conduct overnight reverse repo operations continuously from August 27 to September 1, with a daily operation cap of 600 billion yuan.

Behind the increased frequency of overnight reverse repo operations lies an adjustment in the People's Bank of China's liquidity management approach. For a long time, the 7-day reverse repo has been the main instrument in open market operations, balancing operational precision with the pressure of maturity rollovers. However, in recent years, the proportion of overnight instruments in money market repo transactions has exceeded 90%, making overnight financing an increasingly important tool for financial institutions' liquidity management. As the market structure changes, the supply of tools must keep pace. Adding the overnight reverse repo variety in response to market needs is the central bank's direct answer to evolving short-term liquidity demand.

From an operational mechanism perspective, the overnight reverse repo adopts a fixed-rate, quantity-tender model, consistent with the 7-day reverse repo, yet it features a distinctly shorter tenor and higher precision. Zou Lan, Deputy Governor of the People's Bank of China, previously stated that some institutions' short-term liquidity needs may only last two to three days. If only the 7-day reverse repo operation were conducted, liquidity would accumulate to some extent. In such cases, conducting overnight reverse repo operations can improve liquidity management efficiency and reduce costs for financial institutions. This refined approach of "trimming peaks and filling valleys" has been fully validated in just two months of actual practice. At the end of June, the weighted average rate of DR001 (the overnight pledged repo rate among deposit-taking institutions in the interbank market) closed at 1.36%, showing notably smaller fluctuations compared to typical quarter-end periods in recent years. During the mid-August tax period operations, DR001 remained largely stable within the 1.36% to 1.38% range, without the sharp spikes commonly seen in previous tax periods. It can be said that the overnight reverse repo is using more precise "drip irrigation" to make the liquidity environment operate more smoothly and orderly.

For the bond market, the impact of overnight reverse repo operations is multi-dimensional. The most immediate change is the reduction in liquidity volatility, with DR001 showing continuously strengthening stability around the policy rate. The influence of traditional disturbance factors, such as tax-period fund outflows, government bond issuance payments, and month-end bank assessments, is gradually weakening, providing a more stable short-term pricing benchmark for the bond market. Looking ahead, as the operational mechanism continues to improve, the precision of the People's Bank of China's regulation of short-term interest rates will keep enhancing, the transmission efficiency of monetary policy will further improve, and a solid liquidity foundation will be laid for the stable operation of financial markets and the high-quality development of the real economy.