The present paper studied and discovered the fact that some alcohols arose chemiluminescence in alkaline H

2

O

2

. The mechanism of such chemi-luminescence is discussed in brief and is shown that the chemiluminescence occurs in the step of alcohol oxidized into aldehyde. The quantum yield is also estimated by simple methods. As for the idea of the enhancement of CL by the alcohol

the present paper gives a newer explanation.The said system EtOH-H

2

O

2

-OH

-

has been applied to the determination of metal ions

since we found that Co(Ⅱ)

Fe(Ⅱ)

Ni(Ⅱ)

Pb(Ⅱ)

Hg (Ⅱ)

Cr(Ⅲ)

Ag(Ⅰ)

Mn(Ⅱ)

Eu(Ⅲ)

and Cu(Ⅱ) could be used as an analyze respectively to catalyze the oxidation reaction of H

2

O

2

with alcohols under favorable conditions. The procedure of determining Co(Ⅱ) by the application of the said system has been shown in detail

and the detection limit of the Co(Ⅱ) is calculated as 2×10

-8

g/ml.