Report Industry Investment Rating - Not provided in the content Core Viewpoints - In a high - volatility bond market environment, balancing offense and defense is a challenge for investors. Although credit bonds lack effective coupon protection and have lower liquidity, coupon - type assets still have value for increased holdings. By decomposing the comprehensive return of credit bonds into holding return and capital gain and conducting stress tests on individual bonds, investors can adjust their allocation strategies [2][10]. - The increase in bond market volatility places higher requirements on investors' liability - side management and trading timing capabilities [3][15]. Summary by Relevant Catalogs I. Individual Bond Stress Test Tool - **Bond Market Volatility Background**: Since last September, the bond market has experienced multiple fluctuations. After the "924" new policy impulse, it entered a cycle of redemptions and sharp declines. In November, with the release of loose capital signals, it entered a pre - emptive trading phase. After the New Year, the bond market was affected by factors such as tight capital in January, strong equity performance and improved economic fundamentals in February, and volatile equity trends and tariff factors in March. As of last Friday, the proportion of outstanding credit bonds with yields below 2.2% rose to 71%, and those below 2.0% reached 38%, leading to high volatility in the bond market [9]. - **Analysis of Credit Bonds**: Credit bonds currently lack effective coupon protection and have lower liquidity than interest - rate bonds. The window period for market trends is short under high volatility. To balance liquidity and return enhancement, coupon - type assets are still worth increasing. Decomposing the comprehensive return of credit bonds into holding return and capital gain can help judge entry and exit points [2][10]. - **Stress Test of Urban Investment Bonds**: In April, the absolute yield of urban investment bonds dropped to a low level. Assuming purchase at the current coupon rate and holding for two weeks or three months, in the two - week holding scenario, low - coupon urban investment bonds' comprehensive return can hardly withstand capital gain losses. In the three - month holding scenario, for a 50bp yield increase, the comprehensive return of 1 - year urban investment bonds is still positive; for a 20bp increase, some AA and AA(2) term varieties can also achieve coupon coverage of losses [2][10]. - **Stress Test of Bank Sub - debt**: The stress test results of bank sub - debt are less favorable. Whether holding for two weeks or three months, even when facing a 20bp yield increase, the comprehensive return of Tier 2 capital bonds and perpetual bank bonds is difficult to maintain in the positive range [3][13].