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The present research aims to develop a new kind of green composite curing agent, PZ-1 in which the industrial and agricultural waste such as calcium carbide slag and plant ash are adopted to be raw materials, based on the response surface methodology and unconfined compression strength test results. Then, the mechanism of PZ-1 reinforcement of organic sludge was revealed through SEM and XRD analysis. The test results show that with the increase of calcium carbide slag and plant ash content, the unconfined compressive strength of solidified organic sludge shows a phenomenon of first increasing, then decreasing and continuously increasing, respectively, in which the effect of calcium carbide slag on carbide slag is more significant. The optimal ratio of carbide slag and plant ash in PZ-1 is 20:14. Ca (OH)2 in calcium carbide slag will play the role of neutralizing the humic acid existing in the organic silt and further provide the alkaline environment for the stabilization of PZ-1. The main product of stabilized organic silt is C-S-H gel, calcite, dolomite, ettringite, in which C-S-H gel plays the role of producing the structure of stabilized organic silt and the left 3 minerals behave in filling the pore of silt and further enhancing the density of silt. [ABSTRACT FROM AUTHOR]