Biochar,　with　its　dual　roles　of　soil　remediation　and　carbon　sequestration,　is　gradually　demonstrating　great　potential　for　sustainability　in　agricultural　and　ecological　aspects.　In　this　study,　a　porous　biochar　derived　from　walnut　shell　wastes　was　prepared　via　a　facile　pyrolysis　coupling　with　in　-situ　alkali　etching　method.　An　incubation　study　was　conducted　to　investigate　its　performance　in　stabilizing　copper　(Cu)　and　lead　(Pb)　co　-contaminated　soils　under　different　utilization　types.　The　biochar　effectively　decreased　the　bioavailable　Cu　(8.5　-91.68%)　and　Pb　(5.03　-88.54%),　while　increasing　the　pH,　CEC,　and　SOM　contents　in　both　soils.　Additionally,　the　results　of　sequential　extraction　confirmed　that　biochar　promoted　the　transformation　of　the　labile　fraction　of　Cu　and　Pb　to　stable　fractions.　The　mechanisms　of　Cu　and　Pb　stabilization　were　found　to　be　greatly　dependent　on　the　soil　types.　For　tea　plantation　yellow　soil,　the　main　approach　for　stabilization　was　the　complexation　of　heavy　metals　with　abundant　organic　functional　groups　and　deprotonation　structure.　Surface　electrostatic　adsorption　and　cation　exchange　contributed　to　the　immobilization　of　Cu　and　Pb　in　vegetable　-cultivated　purple　soil.　This　research　provides　valuable　information　for　the　stabilization　of　Cu　and　Pb　co　-contaminated　soils　for　different　utilization　types　using　environmentally　-friendly　biochar.