The method of designing variants of skidding trails nets is considered for cutting areas which has undeveloped areas (areas of young trees, swamps, territories of natural objects, etc.) when parameters are changed for slope angles of main and strip skid trails and the location of the loading point. An algorithm is developed and presented for allocation homogeneous areas where strip skidding trails are located parallel to each other and adjacent to one main skidding trail. To assess the effectiveness of variants of trail nets, the indicators were used by the average skidding distance and volume of cargo work, which are calculated directly on the basis of geometric characteristics for each of variants of trail nets. The calculation of the values of the efficiency indicators and the design of the trail nets is carried out by a developed computer program with a sequential change in the variable parameters. Graphs of the results are presented calculations of the average skidding distance and the volume of cargo work which depend on slope angles of the main skid trails and some values of the coordinates of the loading point. It was determined the ranges of variation of the efficiency parameters and the conditions under which they take the minimum values.