Carbon emission of Shenzhen metro was analyzed on basis of the power consumption of train traction and metro station. First of all, power consumption of train traction was calculated according to the annual mileage and power consumption of train in 100km. In 2008, all trains of Shenzhen metro consumed 25.14GW · h power. In 2009, power consumption of train traction was 26.35GW · h. And then, power consumption of metro station was analyzed according to monthly average temperature and the quantity of metro station. In 2008, all metro stations of Shenzhen metro consumed108.21GW · h power. In 2009, power consumption of metro station was 112.2GW · h. After this, carbon emission of Shenzhen metro was calculated according to 1kW · h power carbon emission of China southern power grid. In 2008,1kW · h power of China southern power grid emitted 210.36g carbon. In 2009, carbon emission of 1kW · h power was 206.21g. Accordingly, in 2008, Shenzhen metro emitted 28052.695 tons carbon. Per-passenger consumed 0.984kW · h power and emitted 207.025g carbon. In 2009, carbon emission of Shenzhen metro was 28572.561 tons. Per-passenger consumed 1.002kW · h power and emitted 206.697g carbon. In the end, carbon emission of per-passenger of Shenzhen metro was compared with Shenzhen Bus, medium-bus, taxi and Hong Kong metro. In 2008, per-passenger of Shenzhen taxi emitted 450.125g carbon and was 2.174 times of Shenzhen metro. Carbon emission of per-passenger of Shenzhen bus and medium bus was 103.886g and 164.429g. Shenzhen metro was 1.99 times of bus and 1.26 times of medium-bus. Per-passenger of Hong Kong metro consumed 0.988kW · h power and emitted 166.752g carbon in 2008. Power consumption of per-passenger of Shenzhen metro was almost equal to Hong Kong metro. But carbon emission of per-passenger was 1.24 times of Hong Kong metro. The reason was the power used by Hong Kong metro emitted lesser carbon than China southern power grid. In 2008, 1kW · h power of China Light & Power Company and Hong Kong Electric Holdings Limited emitted 153.73g and 203.27g carbon. 75% power of Hong Kong metro was supplied by China Light & Power Company. Others power was supplied by Hong Kong Electric Holdings Limited. In additional, carbon emission and passenger rides of Shenzhen metro in 2012 were predicted according to the quantity of metro station and length of five new metro lines they would operate in 2010 and 2011. The results showed that, in 2012, Shenzhen metro would emit 266263.21 tons carbon and is 9.32times of emission in 2009. According to the growth rate of Shenzhen public traffic passenger rides in 2006-2009, passenger rides would increases from 22.74billions in 2009 to 29.45billions in 2012. If the share of Shenzhen metro passenger rides in Shenzhen public traffic is 40%, similar to the share of Hong Kong metro in public traffic, per-passenger would emit 226.04g carbon and increase 9.36% than emission in 2009. If the share is 30%, similar to the share of Shanghai metro, per-passenger would emit 301.39g carbon and increase 45.81% than emission in 2009. If the share is 20%, similar to the share of Guangzhou metro, per-passenger would emit 452.08g carbon and increase 118.71% than emission in 2009.