It is submitted that the harmfulness and reasons of the broken of leading rope during stringing engineering through analyzing in detail.

The construction technology of "winding-traction method" for stringing the leading rope under tension means to install a special stringing pulley block in the middle of the tower arm top first, place a piece of leading rope then, which is used to pull and replace the required 5 leading ropes.

In the high-voltage electric network construction,the craft that uses dynamic parachute paying-off leading string to assist to complete overhead transmission line construction has effectively settled the "long-standing" problems of time limit for the project,shoots compensation difficulty and the great crossing construction.

With the development of electric construction, it is eager to solve paying-off leading string technology that crossing great river, lake, mountain forest and deep valley, as well as protection zone of nature resources, special geographical environment etc.

Constructing method of one towing three strain-expanded pilot wire used in 500 kV one way line;

In the construction of stringing transmission line,to adopt the process of pilot wire setting-out with dynamic parachute can efficiently solve the difficult problems such as:young crops compensation,cross bridging,and other undesirable geographic construction environment.