Abstract: With sodium alginate/gelatin solution as printing material, 3D low-temperature deposition manufacturing (LDM) technique was applied to print wires in the forming environment at 6℃. The effects of extrusion pressure, solution viscosity and nozzle speed on extrusion swell rates and extrusion stretching rates obtained by experiment and theoretical calculation were studied and compared. The optimum printing parameters were obtained. The dimensional accuracy of the printed parts with the optimum printing parameters was discussed. The results show that the extrusion swell rate of the wire decreased with the solution viscosity increasing and increased with the extrusion pressure increasing; the extrusion stretching rate increased with the increase of the nozzle speed. The optimum printing parameters were listed as follows:solution viscosity of 1.26 Pa·s, extrusion pressure of 80 kPa and nozzle speed of 8 mm·s^-1. With this process, the forming effect of the wire was relatively good, and the relative error between tested and theoretical values was the minimum. With the optimum printing parameters, the dimensions of printed parts were adjusted on the basis of theoretical calculation of extrusion swell rate and extrusion stretching rate. After the adjustment, the relative errors between the actual and designed size of the printed rectangular part and hollow ring were below 5%, indicating a relatively high printing accuracy.