Nd1.85Ce0.15CuO4-δsingle crystals with zero-resistance temperature Tc0≈21K were successfully grown by self-flux slow cooling method. We have measured the resistivity transition curves along the c-axis in different fields parallel or perpendicular to the sample surface, respectively, and at fixed field H=0.5T for various angles. The result shows that the field dependence of differential-resistance peak temperature Tp follows the formula H=H0(1-Tp(h)/Tp(0))2　for H//c-axis and H//ab-plane, respectively. The angular dependence of peak temperature Tp can be scaled by the effective mass model as Tp∝H1/2(cos2θ+sin2θ/γ2)1/4. The anisotropic parameter γ of the crystal is about 45.