Abstract: In order to eliminate the hidden danger of safety operation fundamentally in cable system which are brought by undesirable lead seals in electric cable accessories,it improves the existing sealing technology. At present,the undesirable phenomena on the lead lead sealing position of the cable accessories are insufficient seal thickness,false welding between lead seal and aluminum sheath,cracks on seal positions,excessive sealing temperature. It divides lead sealing technology into pre-sealing lead and lead sealing. The two temperature are less than 150 ℃ . The operating time are controlled within 15 minutes and 30 minutes. The lead sealing cables should be cooled at least 1 hour. The installation personnel are trained and made some preliminary assessments which adopts the improved lead sealing technology. The qualified rate of seal time is above 78. 5%. The compacting qualified rate of lead sealing sections reaches 85. 7%.