Abstract: The complex reaction kinetics of L-H. mechanism in triangular reaction of isomerzation of butenes has been investigated in a flowrecirculation glass reactor. X-ray analysis showed that the MoBiP2.2/SiO2 catalyst contained the phase of bismuth phosphate. The acidic concentration of the catalyst was titrated by butylamine with the method of adsorption of coloured indicator. The catalyst exhibited moderete acidity. The brousted and lewis acidity was measured by the infared spectroscopic method with pyridine adsorbedon catalyst. Gas-solid chromatography has been used to measure the heat of adsorption of 1-butene and 2-butene respectively. The dependence of the apparent activation energies on the intrinsical activation energies of the isomerization of 1-butene was discussed. The parameters of the kinetic equations were estimated with the mothod of orthogonal design. The kinetic equations for the formation of trans 2 butene and cis-2-butene respectively by isomerzation were developed.