Crane use level shows that the crane used frequently during the entire design life, According to the design life period general work cycle number N is divided into ten levels (see table 1).
Table 1:
| Crane use level | general work cycle number N | annotation |
| U0 | 1.6*104 |
Not often use |
| U1 | 2.2*104 | |
| U2 | 3.3*104 | |
| U3 | 1.25*105 | |
| U4 | 2.5*105 |
Free to use |
| U5 | 5*105 |
Often secondary to use |
| U6 | 1*106 |
Don't always busy to use |
| U7 U8 U9 |
2*106 4*106 >4*106 |
忙しい使用 |
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