Based on the extended scalar nonlinear Schrdinger equation, the influence of pumping schemes on the properties of dissipative solitons is investigated theoretically in passively mode-locked ytterbium-doped fiber laser with positive dispersion cavity. The results show that, under the condition of the same initial overall gain, the dissipative solitons obtained in the backward-pumped fiber laser have narrower spectral width, shorter pulse duration and higher pulse peak power than those of forward pumping scheme for the given gain saturation energy. Moreover, the linear fitting degree of the pulse chirp is lower. For the forward pumping and backward pumping schemes, the pulse energies of the dissipative solitons are equal with the same gain saturation energy, but the differences of the output spectral and temporal waveforms increase as the incrense of the gain saturation energy.