NCl(a1Δ) /I（2P3/2）System was studied using microwave discharge Cl2/He plasma as Cl atoms source. Strong I (2P1/2) radiation at 1 315nm was obtained. The considerable changes of NCl (a1Δ) and NCl (b1Σ) radiation at 1 077nm and 665nm respectively were observed when a little amount of I2 was injected into the flow of Cl and HN3, namely NCl (a1Δ) radiation at 1 077nm decreased rapidly while NCl(b1Σ) radiation at 665nm increased rapidly due to the reactions NCl(a1Δ)+I(2P3/2)→ NCl(X3Σ)+I(2P1/2) and NCl(a1Δ)+I(2P1/2)→NCl(b1Σ)+I(2P3/2). The intensity dependence of I (2P1/2) radiation at 1 315nm on He, Cl2, HN3 and I2 flow rate was investigated. The results show that the optimum flow rate for gases of He, I２，Cl２ and ＨＮ３ are 1～4, 0.01～0.03, 1 and 1～2mmol/s respectively.
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