目的　观察 Ｔ Ｎ Ｆα对甲状腺细胞肌醇脂质／ 钙离子（ Ｉｎｓ／ Ｃａ２ ＋ ） 系统的作用。方法　利用激光扫描共聚焦显微镜（ Ｌ Ｓ Ｃ Ｍ） 观察 Ｔ Ｎ Ｆα对鼠甲状腺 Ｆ Ｒ Ｔ Ｌ５ 细胞内 Ｃａ２ ＋ 的影响。实验前细胞以不含 Ｔ Ｓ Ｈ 的５ Ｈ（５ 种激素） 培养液培养３ 天，将待测细胞以 Ｆｌｕｏ３ 负载，分别加入不同浓度的 Ｔ Ｎ Ｆα，以 Ｌ Ｓ Ｃ Ｍ 扫描（４８８ｎｍ ） 测定细胞内 Ｃａ２ ＋ ，观察 Ｔ Ｎ Ｆα的作用。结果　１ ． Ｔ Ｎ Ｆα可降低 Ｆ Ｒ Ｔ Ｌ５ 细胞内基础的 Ｃａ２ ＋ 水平，其效应随 Ｔ Ｎ Ｆα浓度的增加而增强。２ ． Ｔ Ｎ Ｆα可抑制 Ｔ Ｓ Ｈ 刺激甲状腺 Ｆ Ｒ Ｔ Ｌ５ 细胞 Ｃａ２ ＋ 升高的效应。结论　 Ｔ Ｎ Ｆα可以通过抑制甲状腺细胞 Ｉｎｓ／ Ｃａ２ ＋ 系统发挥其抑制效应。 Objective To observe the effect of T N Fα on the inositol lipid / calcium ion (Ins / Ca2 +) system in thyroid cells. Methods The laser scanning confocal microscope (L S C M) was used to observe the effects of T N Fα on intracellular Ca 2+ in FTL5 cells of rat thyroid. Before the experiment, cells were cultured in 5 H (5 hormones) medium without T S H for 3 days. The cells to be tested were loaded with Fluo3 and different concentrations of T N Fα were added respectively. (488nm) determination of intracellular Ca2 +, observed the role of T N F  α. Results 1. T N F  α can reduce the basis of intracellular F  L  5 cells Ca2  level, the effect of T  F  α concentration increases. 2. T N F  α can inhibit T S H stimulation of thyroid F R T L  5 cells Ca2 + effect. Conclusion T N Fα can exert its inhibitory effect by inhibiting the Ins / Ca2 + system of thyroid cells.