the basic principle of engineering valuation: the decomposition of projects and the combination of prices. Partial project cost (or unit price measure project cost) = σ (basic construction unit quantity × corresponding unit price).

1. Project valuation is divided into two parts: project measurement and project pricing.

2. The unit project can be divided into sub-projects according to the structural parts, road length, construction characteristics or construction tasks. According to different construction methods, materials, working procedures and road length, divisional works are decomposed in more detail and divided into simpler and smaller parts, that is, subdivisional works.

3. Engineering measurement includes the division of engineering projects and the calculation of engineering quantities.