Abstract: A novel type of A1PO₄ molecular sieves named CFAP-5 and silicophosphoalu-minate molecular sieves named CFSAPO-5 were synthesised hydro thermally in the system of Pr₃2O₃-P₂O₅-H₂Oand Pr₃N-Al₂O₃-P₂O₅-SiO₂-H₂Orespectively. The molar composition of reactants is. Pr₃N:Al₂O₃:P₂O₅:H₂O = 1:(1~1.2):1:(40-80) for CFAP-5 and Pr₃N:Al₂O₃ :P₂O₅:SiO₂:H₂O =1:(1~1.2): 1: (0.5-2): (40-80) for CFSAPO-5. Dipropylamine can also be used as "template". According to the study of XRD, 1R, TG, DTAand adsorption, the original product of CFAP-5 was changed into a form of molecular sieve after cal-cined at a range of 300-450℃ and CFSAPO-5 at a range of 300-600℃ respectively. The largest free dimension of adsorption window is 4.4-4.9A.