Compound cross-linking chemical is compounded by premium priced organic metal salts, derivatives of carbon acid, and low-cost organic metal salts in paper waste liquid in a certain percentage. The compound cross-linking chemical has two characteristics. one is that you can regulate the time of cross-linking. The other is you can regulate the Strength of cross-linking. Repeated experimental data shows that it has a Poor performance of cross-linking when premium priced organic metal salts and derivatives of carbon acid or low-cost organic metal salts react .Separately, you can regulate the cross-linking time(1～60h)and cross-linking Strength[(5～50)?04 mPa?s]of polymer(for example hydro polyacrylamide) when the three materials used by a certain percentage. And it shows outstanding effect of slacking cross-linking. It is easy to control in Field construction and we can increase the success rate. Mechanism Analysis that inducing effect is the key of delay the gelation of cross-linking chemical.