Acidity and catalytic activity of Zr(SO4)2 and Ti(SO4)2 calcined at 500-800°C were studied. The products obtained by calcination at 725°C for Zr(SO4)2 and at 625°C for Ti(SO4)2 showed the highest activity for the cracking of cumene among samples calcined at other temperatures; the former showed an acid strength of -13.16<H0≤-12.70 and the activity for the reaction of pentane.