The selection of the distribution network connection mode is the precondition and key base work for improving the technical and economic of the distribution system. To take into account the influence of uncertainties in power network expansion planning, the fuzzy and blind number theory is deduced and used for measurement and calculation of uncertain information which influence the final decision. Then an evaluation method has been used to evaluate technical and economic indicators of projects. Case study shows that, based on fuzzy and blind theory used to selection of network connection mode, the validity and practicability of the proposed method is verified.