This paper has developed a new process on pyrolusite, whose valid composition is MnO2-absorbing NOx (NO and NO2)- In the new process, Mn(NO3)(2) is produced after absorption. It can be sold directly or can be decomposed into MnO2 and HNO3 by heating. As a product with higher added value, MnO2 can be sold directly and also recycled into the absorption system as an absorbent. The curves of log p(NOx)-pH at 298 K and 343 K are plotted, respectively. The purification curves of Ca, Mg, Al, and Fe at 298 K are respectively plotted. The theoretical analysis result is that pyrolusite-absorbing NOx in a subacidic solution at normal temperature can be satisfied with the Integrated Emission Standard of Air Pollutants (22.621 Pa; GB16297-1996, China). Meanwhile, in the experiment, if the temperature of the pyrolusite serum is 303 K, pH = 4, and the solution contains 90 g L-1 of MnO2, the absorptivity for 3000 mg m(-3) of NOx is 89.2%. The purity of the end product MnO2 is more than 99.995%.