直接输入a1试试呢？

这样子吗，只显示这么多嘞
a1
Call:
gam(formula = death ~ PM2.5lag01 + s(time, df = 7 * 5 + 1) +
    s(T, df = 4) + s(P, df = 4) + s(RH, df = 4) + s(v, df = 4) +
    as.factor(ya), family = quasipoisson, data = x2)

Degrees of Freedom: 1824 total; 1770.002 Residual
因为不存在，1个观察量被删除了
Residual Deviance: 3332.388

可以用coefficients(summary.glm(a1))或者gam.exact(a1)
如果单独看系数用a1$coefficients就行