According to the detecting principle of the ion stored in penning ion trap

the paper systematically analyzes the relationship between ion spectrum’s detective sensitivity

signal to noise ratio

resolution factor and quality factor in Penning ion trap.The result indicates that the degree of sensitive detection and SNR is proportional to Q2;ion spectrum’s resolution factor is better when Q value is bigger.Ion spectrum with high detective sensitivity

SNR and resolution factor is got by applying proper Q（Q≈120） and restraining noises of experiment instrument and detection loop.Clusters are H+

H+2

H+3

H+4

H+5

H+6 by identification Ion spectrum with high detective sensitivity

H+4

H+6 and H+3

H+5 are produced by collision compound reaction.