According to the related technical requirements on the core drilling in quasi-horizontal hole construction and by using of the existing CS 1000P6L core drill and common wire-line coring tools, the setting and fishing advices of inner pipe assembly were designed and improved for regular operation of ordinary wire-line core drilling technology under the condition of core drilling dip close to zero. Comparing with the effect received by the commonly used trip-round coring, the working efficiency was greatly improved with purchase cost saving of special drill rod, wire-line drilling tools and fishing appliance. The improved conveying device has the advantages of simple structure, reliable performance, low cost and easy operation. It is proved in field production practice that the geological requirements are met with expected purpose and effect, the experience is accumulated for the core drilling construction in quasi-horizontal hole.