Applying the CCK-8 kit to analyse cell proliferation, the OD values of the reagents are in a direct ratio to the number of living cells. Several studies have noted that, due to the lack of bioactive molecules in alginate, the rate of cell proliferation was extremely slow. Adding collagen to an alginate hydrogel system obviously can improve the biomimetic property of the bioink and is good for the proliferation of printed cells. Incorporation of collagen resulted in a more fibrous structure that cells may adhere to and, therefore, grow much efficiently. However, as the culture time increased, cells in the constructs showed a lack of degradation of the alginate hydrogel system, and their proliferation rate was found to be much slower after culturing for 2 days. Incubating with sodium citrate to accelerate the degradation process of the alginate hydrogel system is helpful for the growth and proliferation of the printed cells; this finding has been proven with the increased OD values in the CCK-8 result and increased cell numbers in the immunofluorescence staining results.