The spinning conditions that could diminish the spinning instability of polypropylene/polyethylene blends were investigated. By frequency analysis, it was found that the draw resonance possessed harmonic overtones and the period of draw resonance was proportional to the residence time. By mixing PP with PE, the draw resonance was attenuated but the spin breakage occurred easily at high PE content where PE phases became continuous. The melt fracture of PE at low spinning temperature was the onset parameter of the draw resonance for PP/PE blends. The die diameter had not significant effect on the D_max/D_min value of draw resonance at the same flow rate. The critical draw ratio was decreased with increasing spin length. At high die Ln ratio, the draw resonance was not affected by the L/D ratio, but the critical draw ratio was significantly decreased as L/D ratio became small.