Group 1 - The report discusses the short covering strategy in the bond market, specifically how the borrowing balance of individual bonds relative to other bonds of the same maturity can lead to downward pressure on interest rates [2][3][19] - The borrowing balance of a specific bond typically follows a pattern where it starts at zero upon issuance, increases as it becomes an active bond, peaks, and then declines as it transitions to a less active status [19][20] - When the borrowing amount of an active bond is significantly lower than that of a less active bond, and if interest rates decline, short sellers of the less active bond will need to cover their positions, leading to additional buying and compression of the yield spread between the two bonds [3][19][20] Group 2 - The report analyzes the practical application of the short covering strategy on key maturities, including 10Y government bonds, 10Y policy bank bonds, and 30Y government bonds, concluding that the 10Y policy bank bond shows the best results [6][31][40] - The 10Y policy bank bond's active bond (250210) switched on May 27, with the less active bond (250205) showing a borrowing amount of approximately 140 billion, which later equalized around 700 billion, while the yield spread compressed from 4-5 basis points to 1.2 basis points [6][31][40] - The analysis indicates that the 30Y government bond's short covering strategy results are less favorable than the 10Y policy bank bond due to greater sensitivity to yield spread expectations and less significant changes in borrowing amounts [40][41]