In order to improve the direction of arrival (DOA) estimation capability and accuracy on condition of low signaltonoise ratio, a new conical multilayer uniform circular array is designed based on cylindrical multilayer uniform circular array. The array elements on the element of cone are equivalent to a uniform linear array, and the linear array received data constitute a new array manifold matrix. Compared these two kinds of array manifold CramerRao bound (CRB), the result shows that on conditions of low signaltonoise ratio and high elevation， the new array can get higher estimation accuracy and the probability of success relative to cylindrical multilayer uniform circular array. In the simulation, the superiority of the array in the multisource is verified by using the algorithm of the twodimensional multiple signal classification (2D MUSIC) on conditions of low SNR and high elevation, and the effect of the spatial angle on the performance of the array DOA estimation is given.