In order to obtain excellent output signals from wavelength channels, the structures of reflecting splitters based on photonic crystal U- shaped resonators (PCUR) are designed. Electromagnetic wave power splitting characteristics of these structures are studied by the time- domain finite- difference method. Four symmetrical structures can split wavelength power into two equal parts, and all of them have the characteristic of high transmission efficiency in the third communication window. Five asymmetrical structures have the characteristic of low signal crosstalk at the peak wavelength. According to our needs of designs, high transmission efficiency splitters with different channel wavelength intervals can be obtained by changing radii of scattering dielectric rods or 3×2 inner rods of the two PCURs in the symmetrical structure of reflecting splitters based on 3×2 PCURs. The results show that these micro reflecting splitters based on PCURs have the advantages of excellent wavelength selectivity, flexible designs, low crosstalk at peak wavelength and so on. These structures have potentially applicable value in the fields of low loss optical integrated circuits, high density wavelength optical communication systems etc.