The effects of polyvinyl aliohol (PVA) on the formation of soil water-stable crumbs were determined at two temperatures (10 ℃.,and30℃),three soil [H+] (10 000. 361. 2 、10μmol. L-1 ) and a variety of concentration of PVA. The changes of soil water evaporation and acid soil [H+] caused by PVA were also discussed. The results indicated that 0. 01 % ~0. 1% PVA can effectively from the soil water-stable crumbs. The effect of the 1. 0%PVA was especially remarkable under these conditions. Furthermore, PVA can incr...