  Recently the CDF collaboration has reported the excess in the dijet
invariant-mass distribution of the Wjj events, corresponding to a significance
of 3.2 standard deviations. Considering the lack of similar excesses in the
$\gamma jj$ and $Z jj$ events yet, we propose a new Z' model: Z' couples only
to the second generation quarks. Single production of $\zsc$ as well as
associated production with $W,\gamma, Z$ are mainly from the sea quarks. Only
$W Z'$ production has additional contribution from one valence quark and one
sea quark, which is allowed by CKM mixing. We found that if the new gauge
coupling is large enough, marginally permitted by perturbativity, this new
model can explain the observed CDF $Wjj$ anomaly as well as the lack of $\gm
jj$ and $Z jj$ anomalies. Vanishing coupling of Z'-b-b protects this model from
the constraint of p pbar ->WH -> l\nu b \bar{b}.
