At room temperature, two new different oxovanadium complexes with simple pyrazole (C3H4N2) as ligand were synthesized. VO(pz)4(SO4)? H2O (1) (pz: pyrazole) is a mono-nuclear oxovana- dium complex with pyrazole as terminal ligands. V2O2(μ-pz)(μ-OOSO2)(μ-OCH3)(pz)4 (2) is bi-nuclear oxovanadium complex containing three different bridges, which are pyrazolate, sulphate and methoxy, respectively. The two complexes were characterized by IR, elemental analyses, thermal analyses and X-ray diffraction. The crystal structural data of the complexes 1 and 2 are given as follows: Complex 1, orthorhombic, Pna21, a = 14.547(2) ?, b =10.895(2) ?, c =11.835(2) ?; α=β=γ=90°, V=1875.8(5) ?3, Z = 4, R1 = 0.0485, WR2 = 0.1092. Complex 2, triclinic, P1 , a =8.377(2) ?, b =9.928(2) ?, c = 16.527(3) ?, α = 85.54(3)°, β = 80.92(3)°, γ = 87.92(3)°, R1 = 0.1461, WR2 = 0.4444. The study of non-thermal kinetic de- composition shows that, for complex 1, the possible reaction mechanisms of the two steps are nucleation and growth n=1/3, and three-dimensional pervasion n=2, respectively, and the kinetic equations may be expressed as dα/dT = (A/β)exp(?E/RT){1/3(1?α) [?In(1?α)]?2} and dα/dT = (A/β)exp(?E/RT){3/2(1?α)2/3 [1?(1?α)1/3] ?1}, respectively; for complex 2, the pos- sible reaction mechanisms of the two steps are chemical reaction, and three-dimensional pervasion n=2, respectively; the kinetic equations may be ex- pressed as dα/dT = (A/β)exp(?E/RT)[(1?α)2], anddα/dT = (A/β)exp(?E/RT){3/2(1?α)2/3[1?(1?α)1/3] ?1}, respectively. At room temperature, two new different oxovanadium complexes with simple pyrazole (C3H4N2) as ligand were synthesized. VO (pz) 4 (SO4)? H2O (pz: pyrazole) is a mono-nuclear oxovanadium complex with pyrazole as (μ-OCH3) (pz) 4 (2) is bi-nuclear oxovanadium complex containing three different bridges, which are pyrazolate, sulphate and methoxy, respectively. The two complexes were characterized by IR, elemental analyzes, thermal analyzes and X-ray diffraction. The crystal structural data of the complexes 1 and 2 are given as follows: Complex 1, orthorhombic, Pna21, a = 14.547 (2) ?, b = 10.895 2) ?, c = 11.835 (2)? = Α = β = γ = 90 °, V = 1875.8 (5)? ​​3, Z = 4, R1 = 0.0485, WR2 = 0.1092. Complex 2, triclinic, P1, a = 8.377 (2)?, B = 9.928 (2) ?, c = 16.527 (3) ?,? = 85.54 (3) °,? = 80.92 (3) °,? = 87.92 (3) °, R1 = 0.1461 , WR2 = 0.4444. The study of non-thermal kinetic de- composition that that for complex 1, the possible reaction mechanisms of the two step s are nucleation and growth n = 1/3, and three-dimensional pervasion n = 2, respectively, and the kinetic equations may be expressed as dα / dT = (A / β) exp (1? Α) [? In (1? Α)]? 2 and dα / dT = A / β exp? E / RT 3/2? 1? Α) 1/3]? 1}, respectively; for complex 2, the pos- sible reaction mechanisms of the two steps are chemical reaction, and three-dimensional pervasion n = 2, respectively; the kinetic equations may be ex- (a / β) exp (? E / RT) {(1? α) 2] α) 2/3 [1? (1? α) 1/3]? 1}, respectively.