As　the　principal　cell　of　the　striatum,　medium　spiny　neurons　(MSNs)　are　closely　associated　with　various　motor　dysfunctional　diseases.　In　this　paper,　we　describe　an　electric　compartment　model　constructed　in　NEURON　with　a　realistic　morphology.　Based　on　a　554-compartment　computational　model,　we　researched　the　influence　of　external　current　stimuli,　different　ions　conductance,　and　the　removal　of　partial　dendrites　on　the　physiological　properties　of　the　MSN.　The　main　results　are　the　following:　(1)　in　the　case　of　external　current　stimuli,　various　firing　patterns　appear　in　the　MSN　and　the　model　produces　a　clear　period-adding　bifurcation　phenomenon;　(2)　the　effect　of　distinct　types　of　ion　channels　vary　and　significant　differences　in　discharge　rhythm　exist　even　among　ion　channels　of　the　same　type;　(3)　the　closer　the　removed　dendrite　was　to　the　soma,　the　larger　the　impact　this　had　on　the　discharge　pattern　of　the　MSN.