Abstract: In smelting process,large amount of cables of crane working in hot environment are likely to reduce its useful-life that can’t be known.Inallusion to the question,a temperature inspector system with a semi-conductor element AD590 was designed for monitoring the actual operating environment and status of those electric cables.Directly measure way and NN forecast were used to calculate the cables useful-life.And the period of cable replacement could be more optimized.Also it is possible to replace the cables by stages and in batches.By this prediction data to stock cables,the repertory capital and cost will be lowered.

Key words: crane, cable useful-life, temperature monitoring, NN