The extralong tunnel is difficult to upgrade and transform. Hence, an joint construction plan in both longterm and shortterm is creatively presented for Zheduoshan Tunnel project. The construction schemes are compared and analyzed from the aspects of traffic volume prediction, construction cost, ventilation and escaperescue design, and a practical construction plan, i.e. the national Grade 2 road tunnel main tunnel is constructed and 2 sections of breakthrough parallel heading are set firstly, and then the main tunnel is taken as right tunnel of highspeed tunnel and the brokenthrough parallel heading is taken as left tunnel of highspeed tunnel, is put forward. The results show that the joint construction scheme can effectively reduce the construction cost and social consumption.