Aiming at the special demand of aviation domain to fault missed detection risk, the undesirable false alarms and undesirable lemissed detections risk problem of the chi-square test was searched, and material example and simulation analyzing indicate that snapshot algorithm is incapable of satisfying the aviation requirements for detection risks.

This paper lays the emphasis on the anlaysis of maleriality and detection risks influence on substantive tests,through the scientifically designing time,nature and scope of it,so as to lower the entire auditing risk into acceptable level.

Discussed the normal regulations inspection and the risk inspection at inspection the procedure,inspection strategy,the equipments rating and inspection the period different and similar of etc.

The meaning,frame,main content and application foreground of venture maintenance are expounded,so the conclusion is get that venture maintenance should be the important measure for electric device maintenanc

Discussion on the detection risk of foundation piles dynamic high strain test