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The structure change of low-lying collective excitation states of N = 40 isotones isstudied by solving a five-dimensional collective Hamiltonian with parametersdetermined from relativistic mean field with the parameter set PC-PK1.Paringcorrelation is treated by BCS method with a separable paring force.The potentialenergy surfaces based on RMF show that the shapes of isotones depart from stable sphere gradually as proton number Z increases.