Research result: (1)this paper summed up a leading principle in tunnel waterproof and drainage design of "water environmental balance" with choking up underground water, in order to prevent and control water environmental hazard of ground above tunnel and sluicing hazard in tunnel by establishing interaction chain between tunnel engineering and water environment; (2) this paper analyzed the relations between the slope height, support engineering and between protective of the slope and ecological environment; summed up a design subgrade principle of reducing slope height with support engineering, in order to advance prevention countermeasure for high cutting slope; (3) this paper analyzed the relations between engineering way of cutting slope of subgrade and response of rock-soil mass in the slope; gave up traditional engineering way, which cutting from up to low and support from low to up, to renew turn into a new ideal of design and construction, which is gradual support from up to low and beforehand reinforce in slope foot, in order to kept stability of the cutting slope; (4) this paper summed up a principle of accumulation and reclamation of waste in valley heat area, aiming at environmental problem caused by engineering waste soil.